I hold a bachelor’s degree in psychology from the Faculty of Arts, Charles University, and a master’s degree in biology from the Faculty of Science, Charles University. I am currently pursuing doctoral degrees in both disciplines. I work as a researcher and lecturer at the Faculty of Humanities, Charles University, and at the National Institute of Mental Health.
My research focuses on human sexual orientation, integrating theoretical perspectives and methodological approaches from both biology and psychology. I investigate differences in personality and mental health across individuals of different sexual orientations, while also studying the biological mechanisms underlying the development of non-heterosexuality.
E-mail:
Office hours: based on previous e-mail appointment
sexual orientation
evolutionary approaches to human sexuality
social psychology
2026-present – Faculty of Humanities, Charles University, Department of Psychology and Life Sciences, assistant professor
2025-present – National Institute of Mental Health, Center for Sexual Health and Intervention, junior researcher
2024-2025 – Faculty of Humanities, Charles University, Department of Psychology and Life Sciences, lecturer
2023-present – Faculty of Science, Charles University, Department of Zoology, doctoral program Zoology, PhD thesis: Role of maternal immunity in etiology of human sexual orientation
2023-present – Faculty of Arts, Charles University, Department of Psychology, doctoral program Clinical and Health Psychology, PhD thesis: Sexual and romantic orientation and their correlates in men and women
2025-present – co-investigator of GAČR project Nr. 25-16933S (The influence of gender non-conformity on minority stress and well-being in individuals of diverse sexual orientations)
2022-2024 – principal investigator of GAUK project Nr. 282422 (Psychological factors associated with self-perceived attractiveness in gay and straight men)
Fořt, J., Valentova, J. V., Hudáčová, K., Kunc, B., & Havlíček, J. (2025). An evolutionary perspective on homosexuality: Testing the sexually antagonistic genes hypothesis through familial fertility analysis. Evolution and Human Behavior, 46(1), 106649. https://doi.org/10.1016/j.evolhumbehav.2024.106649
Tureček, P., Fořt, J., & Flegr, J. (2025). Crusaders, monks and family fortunes: Evolutionary models of male homosexuality and related phenomena. Proceedings of the Royal Society B: Biological Sciences, 292(2042), 20242756. https://doi.org/10.1098/rspb.2024.2756
Csajbók, Z., Fořt, J., & Kearns, P. B. (2025). Trajectories of depressive symptoms of mothers and fathers over 11 years. Epidemiology and Psychiatric Sciences, 34. https://doi.org/10.1017/s2045796025000174
Csajbók, Z., Fořt, J., Jonason, P. K., Havlíček, J., Binter, J., & Štěrbová, Z. (2025). Mechanisms creating homogamy in depressiveness in couples: A longitudinal study from Czechia. Scientific Reports, 15(1). https://doi.org/10.1038/s41598-025-93065-7
Fořt, J., Kunc, B., Valentova, J. V., Bártová, K., & Hudáčová, K. (2024). Examining the fraternal birth order effect and sexual orientation: Insights from an East European population. Archives of Sexual Behavior, 53(8), 2905–2922. https://doi.org/10.1007/s10508-024-02892-8
Fořt, J., Flegr, J., Kuba, R., & Kaňková, Š. (2024). Fertility of Czech gay and straight men, women, and their relatives: Testing the sexually antagonistic gene hypothesis. Archives of Sexual Behavior, 53(5), 1747–1761. https://doi.org/10.1007/s10508-024-02827-3
Valentova, J. V., Fořt, J., Freudenfeld, P., Varella, M. A. C., Amaral, B. H., & Havlíček, J. (2023). Different subgroups of homosexuality: Great ideas, little evidence, promising future. Archives of Sexual Behavior, 52(7), 3013–3018. https://doi.org/10.1007/s10508-023-02548-z
Fořt, J., & Kaňková, Š. (2021). Etiologie a evoluční teorie mužské homosexuality [Etiology and Evolutionary Theories of Male Homosexuality]. Československá psychologie, 65, 537–557. https://doi.org/10.51561/cspsych.65.6.537
Charles University
Faculty of Humanities
Pátkova 2137/5
182 00 Praha 8 - Libeň
Czech Republic
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