Folia Parasitologica 72:015 (2025) | DOI: 10.14411/fp.2025.015

Special Issue: Re-assessing host manipulation in Toxoplasma: the underexplored role of sexual transmission - evidence, mechanisms, implications

Ashkan Latifi ORCID..., Jaroslav Flegr ORCID..., ©árka Kaňková ORCID...
Department of Philosophy and History of Sciences, Faculty of Science, Charles University; Viničná 7, 128 00, Prague, Czechia

Latent infection with Toxoplasma gondii (Nicolle et Manceaux, 1908) has been repeatedly correlated with behavioural and physiological changes in both humans and animals. While classically regarded as a parasite transmitted via ingestion or vertical (transplacental) transmission, accumulating evidence suggests that sexual transmission may also contribute to its epidemiology. This review explores the hypothesis that some behavioural effects of toxoplasmosis - especially those related to attraction, sexual activity, and mate choice - may have evolved to facilitate sexual transmission of the parasite. We summarise findings from animal models and human studies that show modified sexual preferences, altered sexual activity, enhanced attractiveness in infected individuals, and elevated prevalence of T. gondii in groups exhibiting high sexual activity or non-traditional sexual behaviour patterns. Particular attention is given to the role of testosterone, which may mediate both behavioural changes and reproductive consequences, such as shifts in offspring sex ratios and fertility outcomes. Direct detection of the parasite in semen and evidence of transmission through insemination in non-human species further support the plausibility of this route. The observed behavioural effects may also intersect with mechanisms previously thought to enhance predation risk, such as altered fear responses to felid odours. Taken together, these findings point to the possibility that sexual transmission, while likely secondary in humans, may have played a more substantial role in the evolutionary history and current ecology of T. gondii than previously appreciated. This perspective also provides an alternative interpretative framework for understanding the broad spectrum of phenotypic changes associated with latent toxoplasmosis. Further interdisciplinary research is required to clarify the relative contribution of sexual transmission to the parasite's life cycle and to assess its implications for public health and theory of host-parasite coevolution.

Keywords: review, toxoplasmosis, manipulation, sexual behaviour, testosterone, sexually transmitted diseases, parasite manipulation.

Received: September 5, 2024; Accepted: April 28, 2025; Published online: May 20, 2025  Show citation

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Latifi, A., Flegr, J., & Kaňková, ©. (2025). Special Issue: Re-assessing host manipulation in Toxoplasma: the underexplored role of sexual transmission - evidence, mechanisms, implications. Folia Parasitologica, 72, Article 2025.015. https://doi.org/10.14411/fp.2025.015

This article is part of Special Issue,  Effects of Latent Toxoplasmosis: Three Decades of Studies.

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    References

    1. Abdoli A. 2014: Toxoplasma, testosterone and behaviour manipulation: the role of parasite strain, host variation, and intensity of infection. Front. Biol. 9: 151-160. Go to original source...
    2. Abdoli A., Ghaffarifar F., Sharifi Z., Taghipour A. 2024: Toxoplasma gondii infection and testosterone alteration: a systematic review and meta-analyses. PLoS One 19: e0297362. Go to original source... Go to PubMed...
    3. Abdulai-Saiku S., Hegde, A., Vyas, A., Mitra, R. 2018: Effects of stress or infection on rat behaviour show robust reversals due to environmental disturbance. F1000 Res. 6: 2097. Go to original source... Go to PubMed...
    4. Abdulai-Saiku S., Tong W.H., Vyas A. 2017: Sexual transmission of cyst-forming coccidian parasites with complex life cycles. Curr. Sex Health Rep. 9: 271-276. Go to original source...
    5. Alvarado-Esquivel C., Estrada-Martinez S., Ramos-Nevarez A., Perez-Alamos A.R., Beristain-Garcia I., Alvarado-Felix A.O., Cerrillo-Soto S.M., Alvarado-Felix G.A., Guido-Arreola C.A., Saenz-Soto L., Sifuentes-Alvarez A. 2021: Is Toxoplasma gondii infection associated with sexual promiscuity? A cross-sectional study. Pathogens 10: 1393. Go to original source... Go to PubMed...
    6. Alvarado-Esquivel C., Sanchez-Anguiano L.F., Hernandez-Tinoco J., Arreola-Chaidez E., Lopez J., Salcido-Meraz K.I., Estrada-Martinez S., Navarrete-Flores J.A., Perez-Alamos A.R., Hernandez-Ochoa M., Rabago-Sanchez E., Liesenfeld O. 2015: High seroprevalence of Toxoplasma gondii infection in female sex workers: a case-control study. Eur. J. Microbiol. Immunol. 5: 285-292. Go to original source... Go to PubMed...
    7. Arantes T.P., Lopes W.D.Z., Ferreira R.M., Pieroni J.S.P., Pinto V.M.R., Sakamoto C.A., da Costa A.J. 2009: Toxoplasma gondii: evidence for the transmission by semen in dogs. Exp. Parasitol. 123: 190-194. Go to original source... Go to PubMed...
    8. Baum M.J., Kelliher K.R. 2009: Complementary roles of the main and accessory olfactory systems in mammalian mate recognition. Annu. Rev. Physiol. 71: 141-160. Go to original source... Go to PubMed...
    9. Berdoy M., Webster J.P., Macdonald D.W. 2000: Fatal attraction in rats infected with Toxoplasma gondii. Proc. Biol. Sci. 267: 1591-1594. Go to original source... Go to PubMed...
    10. Bezerra M.J.G., Cruz J., Kung E.S., Albuquerque P.P.F., Kim P.C.P., Moraes E., Pinheiro J.W., Mota R.A. 2014: Detection of Toxoplasma gondii DNA in fresh and frozen semen from rams in Brazil. Reprod. Domest. Anim. 49: 753-755. Go to original source... Go to PubMed...
    11. Bogitsh B.J., Carter C.E., Oeltmann T.N. (Eds.) 2005: Human Parasitology. Third Edition. Academic Press, New York, 488 pp.
    12. Borráz-León J.I., Rantala M.J., Krams I.A., Cerda-Molina A.L., Contreras-Garduño J. 2022: Are Toxoplasma-infected subjects more attractive, symmetrical, or healthier than non-infected ones? Evidence from subjective and objective measurements. PeerJ 10: e13122. Go to original source... Go to PubMed...
    13. Borráz-León J.I., Rantala M.J., Luoto S., Krams I., Contreras-Garduño J., Cerda-Molina A.L., Krama T. 2021: Toxoplasma gondii and psychopathology: latent infection is associated with interpersonal sensitivity, psychoticism, and higher testosterone levels in men, but not in women. Adapt. Hum. Behav. Physiol. 7: 28-42. Go to original source...
    14. Boyer K.M., Holfels M., Roizen N., Swisher C., Mack D., Remington J., Withers S., Meier P., McLeod R. 2005: Risk factors for Toxoplasma gondii infection in mothers of infants with congenital toxoplasmosis: implications for prenatal management and screening. Am. J. Obstet. Gynecol. 192: 564-571. Go to original source... Go to PubMed...
    15. Braude S., Tang-Martinez Z., Taylor G.T. 1999: Stress, testosterone, and the immunoredistribution hypothesis. Behav. Ecol. 10: 345-350. Go to original source...
    16. Brooker J.S., Webb C.E., Clay Z. 2020: Fellatio among male sanctuary-living chimpanzees during a period of social tension. Behaviour 158: 77-87. Go to original source...
    17. Consalter A., Silva A.F., Frazao-Teixeira E., Matos L.F., de Oliveira F.C.R., Leite J.S., Silva F.B.F., Ferreira A.M.R. 2017: Toxoplasma gondii transmission by artificial insemination in sheep with experimentally contaminated frozen semen. Theriogenology 90: 169-174. Go to original source... Go to PubMed...
    18. Contopoulos-Ioannidis D., Wheeler K.M., Ramirez R., Press C., Mui E., Zhou Y., Van Tubbergen C., Prasad S., Maldonado Y., Withers S., Boyer K.M., Noble A.G., Rabiah P., Swisher C.N., Heydemann P., Wroblewski K., Karrison T., Grigg M.E., Montoya J.G., McLeod R. 2015: Clustering of Toxoplasma gondii infections within families of congenitally infected infants. Clin. Infect. Dis. 61: 1815-1824. Go to original source... Go to PubMed...
    19. Dama M.S., Nováková L.M., Flegr J. 2016: Do differences in Toxoplasma prevalence influence global variation in secondary sex ratio? Preliminary ecological regression study. Parasitology 143: 1193-1203. Go to original source... Go to PubMed...
    20. Dass S.A.H., Vasudevan A., Dutta D., Soh L.J.T., Sapolsky R.M., Vyas A. 2011: Protozoan parasite Toxoplasma gondii manipulates mate choice in rats by enhancing attractiveness of males. PLoS One 6: e27229. Go to original source... Go to PubMed...
    21. Dass S.A.H., Vyas A. 2014: Toxoplasma gondii infection reduces predator aversion in rats through epigenetic modulation in the host medial amygdala. Mol. Ecol. 23: 6114-6122. Go to original source... Go to PubMed...
    22. Dubey J.P., Jones J.L. 2008: Toxoplasma gondii infection in humans and animals in the United States. Int. J. Parasitol. 38: 1257-1278. Go to original source... Go to PubMed...
    23. Escudero J., Muñoz J.L., Morera-Herreras T., Hernandez R., Medrano J., Domingo-Echaburu S., Barceló D., Orive G., Lertxundi U. 2021: Antipsychotics as environmental pollutants: an underrated threat? Sci. Total. Environ. 769: 144634. Go to original source... Go to PubMed...
    24. Faroughi E., Amini K. 2021: Molecular identification of Neisseria gonorrhoeae and Toxoplasma gondii isolated from infertile women with vaginal swab samples by Multiplex-PCR. Alborz. Univ. Med. J. 10: 297-304.
    25. Flegr J. 2017: Does Toxoplasma infection increase sexual masochism and submissiveness? Yes and no. Commun. Integr. Biol. 10: e1303590. Go to original source... Go to PubMed...
    26. Flegr J. 2013: Influence of latent Toxoplasma infection on human personality, physiology and morphology: pros and cons of the Toxoplasma-human model in studying the manipulation hypothesis. J. Exp. Biol. 216: 127-133. Go to original source... Go to PubMed...
    27. Flegr J., Blum A.E., Nekola O., Kroupa S. 2019: What people prefer and what they think they prefer in short- and long-term partners. The effects of the phase of the menstrual cycle, hormonal contraception, pregnancy, and the marital and the parenthood status on partner preferences. Evol. Hum. Behav. 40: 112-125. Go to original source...
    28. Flegr J., Escudero D.Q. 2016: Impaired health status and increased incidence of diseases in Toxoplasma-seropositive subjects - an explorative cross-sectional study. Parasitology 143: 1974-1989. Go to original source... Go to PubMed...
    29. Flegr J., Hrdý I. 1994: Influence of chronic toxoplasmosis on some human personality factors. Folia Parasitol. 41: 122-126.
    30. Flegr J., Hruąková M., Hodný Z., Novotná M., Hanuąová J. 2005: Body height, body mass index, waist-hip ratio, fluctuating asymmetry and second to fourth digit ratio in subjects with latent toxoplasmosis. Parasitology 130: 621-628. Go to original source... Go to PubMed...
    31. Flegr J., Klapilová K., Kaňková ©. 2014a: Toxoplasmosis can be a sexually transmitted infection with serious clinical consequences. Not all routes of infection are created equal. Med. Hypotheses 83: 286-289. Go to original source... Go to PubMed...
    32. Flegr J., Kuba R. 2016: The relation of Toxoplasma infection and sexual attraction to fear, danger, pain, and submissiveness. Evol. Psychol. 14: 1-10. Go to original source...
    33. Flegr J., Latifi A., Kaňková ©. 2024: Toxoplasma infection and its sequential impact on physical health, stress, and anxiety: a large cross-sectional study testing the stress-coping hypothesis. Preprint available at medRxiv: https://doi.org/10.1101/2024.10.21.24315879. Go to original source...
    34. Flegr J., Lenochová P., Hodný Z., Vondrová M. 2011: Fatal attraction phenomenon in humans: cat odour attractiveness increased for Toxoplasma-infected men while decreased for infected women. PLoS Negl. Trop. Dis. 5: e1389. Go to original source... Go to PubMed...
    35. Flegr J., Lindová J., Kodym P. 2008a: Sex-dependent toxoplasmosis-associated differences in testosterone concentration in humans. Parasitology 135: 427-431. Go to original source... Go to PubMed...
    36. Flegr J., Lindová J., Pivoňková V., Havlíček J. 2008b: Brief Communication: latent toxoplasmosis and salivary testosterone concentration - important confounding factors in second to fourth digit ratio studies. Am. J. Phys. Anthropol. 137: 479-484. Go to original source... Go to PubMed...
    37. Flegr J., Milinski M., Kaňková S., Hula M., Hlaváčová J., Sýkorová K. 2018: Latent toxoplasmosis and olfactory functions of Rh positive and Rh negative subjects. PLoS One 13: e0209773. Go to original source... Go to PubMed...
    38. Flegr J., Prandota J., Sovičková M., Israili Z.H. 2014b: Toxoplasmosis - a global threat. Correlation of latent toxoplasmosis with specific disease burden in a set of 88 countries. PLoS One 9: e90203. Go to original source... Go to PubMed...
    39. Flegr J., Preiss M., Klose J., Havlíček J., Vitáková M., Kodym P. 2003: Decreased level of psychobiological factor novelty seeking and lower intelligence in men latently infected with the protozoan parasite Toxoplasma gondii. Dopamine, a missing link between schizophrenia and toxoplasmosis? Biol. Psychol. 63: 253-268. Go to original source... Go to PubMed...
    40. Foo Y.Z., Nakagawa S., Rhodes G., Simmons L.W. 2017: The effects of sex hormones on immune function: a meta-analysis. Biol. Rev. 92: 551-571. Go to original source... Go to PubMed...
    41. Haskell L., Fusco M.J., Ares L., Sublay B. 1989: Disseminated toxoplasmosis presenting as symptomatic orchitis and nephrotic syndrome. Am. J. Med. Sci. 298: 185-190. Go to original source... Go to PubMed...
    42. Henriquez S.A., Brett R., Alexander J., Pratt J., Roberts C.W. 2009: Neuropsychiatric disease and Toxoplasma gondii infection. Neuroimmunomodulation 16: 122-133. Go to original source... Go to PubMed...
    43. Hlaváčová J., Flegr J., Řeľábek K., Calda P., Kaňková ©. 2021b: Association between latent toxoplasmosis and fertility parameters of men. Andrology 9: 854-862. Go to original source... Go to PubMed...
    44. Hlaváčová J., Flegr J., Řeľábek K., Calda P., Kaňková ©. 2021a: Male-to-female presumed transmission of toxoplasmosis between sexual partners. Am. J. Epidemiol. 190: 386-392. Go to original source... Go to PubMed...
    45. Hodková H. 2006: Behavioural and neurophysiological manifestations of latent toxoplasmosis in mice. Rigorous thesis, Faculty of Science, Charles University, Prague, 104 pp.
    46. Hodková H., Kolbeková P., Skallová A., Lindová J., Flegr J. 2007: Higher perceived dominance in Toxoplasma infected men - a new evidence for role of increased level of testosterone in toxoplasmosis-associated changes in human behaviour. Neuro Endocrinol. Lett. 28: 110-114.
    47. Holub D., Flegr J., Dragomirecká E., Rodriguez M., Preiss M., Novák T., Čermák J., Horáček J., Kodym P., Libiger J., Höschl C., Motlová L.B. 2013: Differences in onset of disease and severity of psychopathology between toxoplasmosis-related and toxoplasmosis-unrelated schizophrenia. Acta Psychiatr. Scand. 127: 227-238. Go to original source... Go to PubMed...
    48. House P.K., Vyas A., Sapolsky R. 2011: Predator cat odors activate sexual arousal pathways in brains of Toxoplasma gondii infected rats. PLoS One 6: e23277. Go to original source... Go to PubMed...
    49. Hull E.M., Muschamp J.W., Sato S. 2004: Dopamine and serotonin: influences on male sexual behaviour. Physiol. Behav. 83: 291-307. Go to original source...
    50. Jacobs L., Remington J.S., Melton M.L. 1960: The resistance of the encysted form of Toxoplasma gondii. J. Parasitol. 46: 11-21. Go to original source...
    51. James W.H. 2010: Potential solutions to problems posed by the offspring sex ratios of people with parasitic and viral infections. Folia Parasitol. 57: 114-120. Go to original source... Go to PubMed...
    52. Johnson S.K., Johnson P.T.J. 2021: Toxoplasmosis: recent advances in understanding the link between infection and host behaviour. Annu. Rev. Anim. Biosci. 9: 249-264. Go to original source... Go to PubMed...
    53. Kaňková ©., Hlaváčová J., Flegr J. 2020: Oral sex: a new, and possibly the most dangerous, route of toxoplasmosis transmission. Med. Hypotheses 141: 109725. Go to original source... Go to PubMed...
    54. Kaňková ©., Kodym P., Frynta D., Vavřinová R., Kuběna A., Flegr J. 2007a: Influence of latent toxoplasmosis on the secondary sex ratio in mice. Parasitology 134: 1709-1717. Go to original source... Go to PubMed...
    55. Kaňková ©., ©ulc J., Nouzová K., Fajfrlik K., Frynta D., Flegr J. 2007b: Women infected with parasite Toxoplasma have more sons. Naturwissenschaften 94: 122-127. Go to original source... Go to PubMed...
    56. Kavaliers M., Choleris E., Pfaff D.W. 2005: Genes, odours and the recognition of parasitized individuals by rodents. Trends Parasitol. 21: 423-429. Go to original source... Go to PubMed...
    57. Kodym P., Malý M., ©vandová E., Lekatková H., Badoutová M., Vlková J., Beneą C., Zástěra M. 2001: Toxoplasma in the Czech Republic 1923-1999: first case to widespread outbreak. In: E. Petersen, A. Pollak, I. Reiter-Owona, Recent trends in research on congenital toxoplasmosis. Int. J. Parasitol. 31: 125-132.
    58. Koch M.O., Weiss R.R., Cruz A.A., Soccol V.T., Goncalves K.A., Bertol M.A.F., Beltrame O.C., Dittrich R.L. 2016: Detection and isolation of Toxoplasma gondii from fresh semen of naturally infected dogs in Southern Brazil. Reprod. Domest. Anim. 51: 550-554. Go to original source... Go to PubMed...
    59. Kopecký R., Příplatová L., Boschetti S., Talmont-Kaminski K., Flegr J. 2022: Le Petit Machiavellian Prince: effects of latent toxoplasmosis on political beliefs and values. Evol. Psychol. 20: 13. Go to original source... Go to PubMed...
    60. Li Y.D., Ma W.J., Kang Q., Qiao L., Tang D.D., Qiu J., Zhang Q.L., Li H. 2015: Night or darkness, which intensifies the feeling of fear? Int. J. Psychophysiol. 97: 46-57. Go to original source... Go to PubMed...
    61. Liu S.G., Qin C., Yao Z.J., Wang D. 2006: Study on the transmission of Toxoplasma gondii by semen in rabbits. Chinese Journal of Parasitology and Parasitic Diseases 24: 166-170.
    62. Lopes P.C., French S.S., Woodhams D.C., Binning S.A. 2022. Infection avoidance behaviours across vertebrate taxa: patterns, processes, and future directions. In: V. Ezenwa, S.M. Altizer and R. Hall (Eds.), Animal Behaviour and Parasitism. Oxford University Press, Oxford, pp. 237-256. Go to original source...
    63. Lopes W.D.Z., Rodriguez J.D., Souza F.A., dos Santos T.R., dos Santos R.S., Rosanese W.M., Lopes W.R.Z., Sakamoto C.A., da Costa A.J. 2013: Sexual transmission of Toxoplasma gondii in sheep. Vet. Parasitol. 195: 47-56. Go to original source... Go to PubMed...
    64. Mazzoni Baldini M.H., D'Adderio A.M., Tanaka Y., Vacari G.Q., Garcia J.L., Duarte J.M.B. 2022: Toxoplasmosis in brown brocket deer (Mazama gouazoubira): reproductive and clinical evaluation following experimental infection. Preprint available at SSRN: http://dx.doi.org/10.2139/ssrn.4030577. Go to original source...
    65. McGregor I.S., Schrama L., Ambermoon P., Dielenberg R.A. 2002: Not all 'predator odours' are equal: cat odour but not 2,4,5 trimethylthiazoline (TMT; fox odour) elicits specific defensive behaviours in rats. Behav. Brain. Res. 129: 1-16. Go to original source... Go to PubMed...
    66. McInnes R.A. 2003: Chronic illness and sexuality. Med. J. Aust. 179: 263-266. Go to original source... Go to PubMed...
    67. Meisheri Y.V., Mehta S., Patel U. 1997: A prospective study of seroprevalence of toxoplasmosis in general population, and in HIV/AIDS patients in Bombay, India. J. Postgrad. Med. 43: 93-97.
    68. Møller A.P., Christe P., Lux E. 1999: Parasitism, host immune function, and sexual selection. Q. Rev. Biol. 74: 3-20. Go to original source... Go to PubMed...
    69. de Moraes E.P.B.X., Batista A.M., Faria E.B., Freire R.L., Freitas A.C., Silva M.A.R., Braga V.A., Mota R.A. 2010: Experimental infection by Toxoplasma gondii using contaminated semen containing different doses of tachyzoites in sheep. Vet. Parasitol. 170: 318-322. Go to original source... Go to PubMed...
    70. Moura A.B., Costa A.J., Jordao S., Paim B.B., Pinto F.R., Di Mauro D.C. 2007: Toxoplasma gondii in semen of experimentally infected swine. Pesq. Vet. Bras. 27: 430-434. Go to original source...
    71. Neave N., Laing S., Fink B., Manning J.T. 2003: Second to fourth digit ratio, testosterone and perceived male dominance. Proc. Biol. Sci. 270: 2167-2172. Go to original source... Go to PubMed...
    72. Nijholt I., Farchi N., Kye M., Sklan E.H., Shoham S., Verbeure B., Owen D., Hochner B., Spiess J., Soreq H., Blank T. 2004: Stress-induced alternative splicing of acetylcholinesterase results in enhanced fear memory and long-term potentiation. Mol. Psychiatry 9: 174-183. Go to original source... Go to PubMed...
    73. Nistal M., Santana A., Paniaqua R., Palacios J. 1986: Testicular toxoplasmosis in two men with the acquired immunodeficiency syndrome (AIDS). Arch. Pathol. Lab. Med. 110: 744-746.
    74. Penn D., Potts W.K. 1998: Chemical signals and parasite-mediated sexual selection. Trends Ecol. Evol. 13: 391-396. Go to original source... Go to PubMed...
    75. Petersen E., Vesco G., Villari S., Buffolano W. 2010: What do we know about risk factors for infection in humans with Toxoplasma gondii and how can we prevent infections? Zoonoses Public Health 57: 8-17. Go to original source... Go to PubMed...
    76. Poirotte C., Kappeler P.M., Ngoubangoye B., Bourgeois S., Moussodji M., Charpentier M.J.E. 2016: Morbid attraction to leopard urine in Toxoplasma-infected chimpanzees. Curr. Biol. 26: R98-R99. Go to original source... Go to PubMed...
    77. Prandovszky E., Gaskell E., Martin H., Dubey J.P., Webster J.P., McConkey G.A. 2011: The neurotropic parasite Toxoplasma gondii increases dopamine metabolism. PLoS One 6: e23866. Go to original source... Go to PubMed...
    78. Prasetyo A.A., Ariapramuda E.R., Al Kindi E., Dirgahayu P., Sari Y., Dharmawan R., Kageyama S. 2014: Men having sex with men in Surakarta, Indonesia: demographics, behavioural characteristics and prevalence of blood borne pathogens. Southeast Asian J. Trop. Med. Public Health 45: 1032.
    79. Prokop P., Litavský J., Provazník Z. 2024: Female Phalangium opilio use fellatio to compensate sexual avoidance. Sci. Rep. 14: 25586. Go to original source... Go to PubMed...
    80. Roberts M.L., Buchanan K.L., Evans M.R. 2004: Testing the immunocompetence handicap hypothesis: a review of the evidence. Anim. Behav. 68: 227-239. Go to original source...
    81. Rouatbi M., Amairia S., Lahmer M., Lassoued N., Rekik M., Wieland B., Mwacharo J.M., Gharbi M. 2019: Detection of Toxoplasma gondii infection in semen of rams used for natural mating in commercial sheep farms in Tunisia. Vet. Parasitol. Reg. Stud. Rep. 18: 100341. Go to original source... Go to PubMed...
    82. Roved J., Westerdahl H., Hasselquist D. 2017: Sex differences in immune responses: hormonal effects, antagonistic selection, and evolutionary consequences. Horm. Behav. 88: 95-105. Go to original source... Go to PubMed...
    83. Santana L.F., Rossi G.A.M., Gaspar R.C., Pinto V.M.R., de Oliveira G.P., da Costa A.J. 2013: Evidence of sexual transmission of Toxoplasma gondii in goats. Small Ruminant Res. 115: 130-133. Go to original source...
    84. Sarabian C., Curtis V., McMullan R. 2018: Evolution of pathogen and parasite avoidance behaviours. Philos. Trans. R. Soc. Lond. B. Biol. Sci. 373: 20170256. Go to original source... Go to PubMed...
    85. Schaefer K., Seidl-Berger A., Windhager S. 2024: Early developmental masculinization among boys: more prenatal testosterone action (assessed via 2D : 4D) renders their faces perceived as masculine but not pretty or cute. Early Hum. Dev. 195: 106071. Go to original source... Go to PubMed...
    86. ©ebánková B., Flegr J. 2024: The digit ratio: scientific methodological challenges and controversies. In: T.K. Shackelford (Ed.), Encyclopedia of Sexual Psychology and Behaviour. Springer, Cham, pp. 1-14. Go to original source...
    87. Sergiel A., Maslak R., Zedrosser A., Pasko L., Garshelis D.L., Reljic S., Huber D. 2014: Fellatio in captive brown bears: evidence of long-term effects of suckling deprivation? Zoo Biol. 33: 349-352. Go to original source... Go to PubMed...
    88. Stulp G., Buunk A.P., Pollet T.V. 2013: Women want taller men more than men want shorter women. Pers. Individ. Differ. 54: 877-883. Go to original source...
    89. Sugita N. 2016: Homosexual fellatio: erect penis licking between male Bonin flying foxes Pteropus pselaphon. PLoS One 11: e0166024. Go to original source... Go to PubMed...
    90. Sýkorová K., Flegr J. 2021: Faster life history strategy manifests itself by lower age at menarche, higher sexual desire, and earlier reproduction in people with worse health. Sci. Rep. 11: Artn 11254. Go to original source...
    91. Tan M., Jones G., Zhu G., Ye J., Hong T., Zhou S., Zhang S., Zhang L. 2009: Fellatio by fruit bats prolongs copulation time. PLoS One 4: e7595. Go to original source... Go to PubMed...
    92. Tong W.H., Hlaváčová J., Abdulai-Saiku S., Kaňková S., Flegr J., Vyas A. 2023: Presence of Toxoplasma gondii tissue cysts in human semen: toxoplasmosis as a potential sexually transmissible infection. J. Infection 86: 60-65. Go to original source... Go to PubMed...
    93. Torrey E.F., Bartko J.J., Lun Z.R., Yolken R.H. 2007: Antibodies to Toxoplasma gondii in patients with schizophrenia: a meta-analysis. Schizophr. Bull. 33: 729-736. Go to original source... Go to PubMed...
    94. Tyebji S., Hannan A.J., Tonkin C.J. 2020: Pathogenic infection in male mice changes sperm small RNA profiles and transgenerationally alters offspring behaviour. Cell Rep. 31: 107573. Go to original source... Go to PubMed...
    95. Ullmann J., Kodym P., Flegr J., Berenová D., Jirsová S., Kaňková S. 2024: Oral sex as a potential route for Toxoplasma gondii transmission: experiment with human semen and laboratory mice model. Acta Parasitol. 69: 1314-1318. Go to original source... Go to PubMed...
    96. Vyas A. 2024: Nuts and bolts of the behavioural manipulation by Toxoplasma gondii. Special Issue on Toxoplasmosis. Folia Parasitol. 71: 017. Go to original source... Go to PubMed...
    97. Vyas A. 2013: Parasite-augmented mate choice and reduction in innate fear in rats infected by Toxoplasma gondii. J. Exp. Biol. 216: 120-126. Go to original source... Go to PubMed...
    98. Vyas A., Kim S.K., Giacomini N., Boothroyd J.C., Sapolsky R.M. 2007a: Behavioural changes induced by Toxoplasma infection of rodents are highly specific to aversion of cat odors. Proc. Natl. Acad. Sci. USA 104: 6442-6447. Go to original source... Go to PubMed...
    99. Vyas A., Kim S.K., Sapolsky R.M. 2007b: The effects of Toxoplasma infection on rodent behaviour are dependent on dose of the stimulus. Neuroscience 148: 342-348. Go to original source... Go to PubMed...
    100. Wanderley F.S., Porto W.J.N., Camara D.R., de Oliveira V.V.G., Garcia J.L., de Albuquerque P.P.F., Oliveira A.A.D., Mota R.A. 2015: Venereal transmission of Toxoplasma gondii in goats after a buck was experimentally infected. Small Ruminant Res. 123: 301-305. Go to original source...

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