In the 21st Century, LGBT activists and their allies have repeatedly claimed that gay people are born gay; and trans people are born in the wrong body. But there is no evidence to substantiate any theory that there is a biological or genetic determinate for homosexuality. Despite Lady Gaga singing that we are all merely “Born This Way.” Even the highly gay-affirmative American Psychological Association had to admit that:

There is no consensus among scientists about the exact reasons that an individual develops a heterosexual, bisexual, gay or lesbian orientation. Although much research has examined the possible genetic, hormonal, developmental, social and cultural influences on sexual orientation, no findings have emerged that permit scientists to conclude that sexual orientation is determined by any particular factor or factors.

What is evident – a high correlation between same-sex attraction and childhood sexual abuse (CSA); especially same-sex abuse in males. But is correlation also causation. I think so. But you can look at some of the evidence that I collected (listed in chronological order) and make up your own mind.

43% of males with same sex attraction reported sexual activity with another male during the ages of 10-12, versus 9% of males with opposite sex attraction.
“Early sexual behavior in adult homosexual and heterosexual males.” Journal of Abnormal Psychology, Manosevitz, M. (1970)
https://psycnet.apa.org/record/2005-09878-001

A large national survey of almost 35,000 Americans showed that more than three times as many men and women who had been sexually abused as children became same sex attracted, versus opposite sex attracted.
“Origins of Sexual Preference: Sexual Preference. Its Development in Men and Women.” Indiana University Press, Alan P. Bell, Martin S. Weinberg, and Sue Kiefer Hammersmith, (1981)

58% of male adolescents who later became same sex attracted suffered sexual abuse as children.
“Sexual Victimization of Boys: An Ongoing Study of an Adolescent Medicine Clinic Population.” Diane Shrier and Robert L. Johnson, The Journal of the National Medical Association, (1988)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2571548/

“More than half of both case and control patients reported a sexual act with a male by age 16 years, approximately 20 percent by age 10 years.”
“The Initiation of Male Homosexual Behavior.” The Journal of the American Medical Association, Harry W. Haverkos, et al., (1989)
https://jamanetwork.com/journals/jama/article-abstract/378099

“Thirty-seven percent of participants reported they had been encouraged or forced to have sexual contact before age 19 with an older or more powerful partner; 94% occurred with men.”
“Self-reported childhood and adolescent sexual abuse among adult homosexual and bisexual men.” Child Abuse & Neglect, Lynda S. Doll, et al., (1992)
https://www.sciencedirect.com/science/article/abs/pii/0145213492900878

“…boys victimized by older men were over four times more likely to be currently engaged in homosexual activity than were non-victims. The finding applied to nearly half the boys who had had such an experience. Further, the adolescents themselves often linked their homosexuality to their sexual victimization experiences.”
“The sexual abuse of male children and adolescents: a review of current research.” The Journal of Child Psychology and Psychiatry, B Watkins and A Bentovim, (1992)
http://www.ncbi.nlm.nih.gov/m/pubmed/1737828/

Finklehor (1987) estimated that between 3% and 31% of American men have been sexually abused before the age of 18. This estimation closely matches the actual prevalence rates of CSA [Childhood Sexual Abuse] among men in the empirical literature, which demonstrated rates between 3% (Lodico & DiClemente, 1994) and 29% (Zierler et al., 1991). In the studies examining CSA in MSM, the prevalence rates were considerably higher and varied from 11.8% (Duncan, 1990) to 37% (Doll et al., 1992).
“Childhood Sexual Abuse in Men Who Have Sex With Men: The Current State of the Science.” The Journal of the Association of Nurses in AIDS Care, Michael V. Relf, (2001)
https://www.sciencedirect.com/science/article/abs/pii/S1055329006602604?via%3Dihub

“In research with 942 nonclinical adult participants, homosexual men and lesbian women reported a significantly higher rate of childhood molestation than did heterosexual men and women. One of the most salient findings was that 46% of the homosexual men in contrast to 7% of the heterosexual men reported homosexual molestation. 22% of lesbian women in contrast to 1% of heterosexual women reported homosexual molestation.”
“Comparative data of childhood and adolescence molestation in heterosexual and homosexual persons.” Archives of Sexual Behavior, ME Tomeo, et al., (2001)
https://pubmed.ncbi.nlm.nih.gov/11565236/

“Fifty men (26%) reported sexual experiences before age 17 with someone at least 5 years older, constituting CSA according to the age-based definition.”
“Gay and bisexual men’s age-discrepant childhood sexual experiences.” The Journal of Sex Research, Jessica L Stanley, Kim Bartholomew, and Doug Oram, (2004)
https://pubmed.ncbi.nlm.nih.gov/15765278/

“This report describes the high prevalence and context of childhood sexual abuse (CSA) among men who have sex with men (MSM) across 3 independent qualitative studies.”
“Childhood sexual abuse in black men who have sex with men: results from three qualitative studies.” Cultural Diversity and Ethnic Minority Psychology, Sheldon D Fields, David Malebranche, and Sonja Feist-Price, (2008)
http://www.ncbi.nlm.nih.gov/pubmed/18954175

“Anecdotal evidence suggests that a significant subset of children abused by clergy identify as gay as adults.”
“The impact of sexual abuse on sexual identity formation in gay men.” The Journal of Child Sexual Abuse, Stephen Brady, (2008)
https://pubmed.ncbi.nlm.nih.gov/19042606/

“Information extracted from 13,000 face-to-face interviews clearly showed those with same-sexual or bisexual orientation were more likely to have experienced negative events in childhood…People who had experienced sexual abuse as children were three times more likely to identify themselves as homosexual or bisexual than those who had not experienced abuse…Also, the more adverse events someone experienced in childhood, the more likely they were to belong to one of the ‘non-exclusively heterosexual” groups.”
“Sexual orientation link to past: study.” Otago Daily News, Allison Rudd (July 23, 2010)
http://www.odt.co.nz/campus/university-otago/117336/sexual-orientation-link-past-study

“The non-exclusively heterosexual groups were more likely to have experienced adverse events in childhood.”
“Multiple aspects of sexual orientation: prevalence and sociodemographic correlates in a New Zealand national survey.” Archives of Sexual Behavior, J Elisabeth Wells, Magnus A McGee, and Annette L Beautrais, (2011)
http://www.ncbi.nlm.nih.gov/pubmed/20567892

“…male sexual minority individuals were 4.9 times more likely to experience childhood sexual abuse.”
“A Meta-Analysis of Disparities in Childhood Sexual Abuse, Parental Physical Abuse, and Peer Victimization Among Sexual Minority and Sexual Nonminority Individuals.” The American Journal of Public Health, Mark S. Friedman, et al., (2011)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3134495/

“CSA prevalence was high in the tested sample (39%).”
“Exploring the role of child sexual abuse and posttraumatic stress disorder symptoms in gay and bisexual men reporting compulsive sexual behavior.” Child Abuse & Neglect, Leah M Blain, et al., (2012)
https://pubmed.ncbi.nlm.nih.gov/22622224/

“Of 575 participants (85% men and 15% transgender), 32% reported childhood sexual experiences with an older partner. Mean age at first experience was 9 years, partners being, on average, 19 years old, and mostly men.”
“Recalled sexual experiences in childhood with older partners: a study of Brazilian men who have sex with men and male-to-female transgender persons.” Archives of Sexual Behavior, Alex Carballo-Diéguez, et al., (2012)
https://pubmed.ncbi.nlm.nih.gov/21484505/

“The high prevalence of CSA in MSM highlights the need to develop resources to educate health care professionals about childhood abuse and subsequently integrate appropriate interventions into clinical settings as well as sexual risk prevention programming.”
“HIV-Infected Men Who Have Sex With Men and Histories of Childhood Sexual Abuse: Implications for Health and Prevention.” The Journal of the Association of Nurses in AIDS Care, Katherine R. Schafer, et al., (2013)
https://www.sciencedirect.com/science/article/abs/pii/S1055329012001872

“In instrumental variable models, history of sexual abuse predicted increased prevalence of same-sex attraction by 2.0 percentage points…Effects of sexual abuse on men’s sexual orientation were substantially larger than on women’s.”
“Does maltreatment in childhood affect sexual orientation in adulthood?” Archives of Sexual Behavior, Andrea L Roberts, M Maria Glymour, and Karestan C Koenen, (2013)
https://pubmed.ncbi.nlm.nih.gov/22976519/

“We found support for this hypothesis in that childhood adversity predicted childhood sexual abuse; that childhood adversity also predicted same-sex sexual attraction, partners, and identity…”
“Considering Alternative Explanations for the Associations Among Childhood Adversity, Childhood Abuse, and Adult Sexual Orientation: Reply to Bailey and Bailey (2013) and Rind (2013).” Archives of Sexual Behavior, Andrea L. Roberts, M. Maria Glymour, and Karestan C. Koenen, (2015)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3951775/#R2

“The researchers also found that same-sex sexual encounters first happen, on average, at 14.5 years, with Hispanic/Latinx and Black non-Hispanic participants reporting a younger age for their first time performing oral sex or engaging in anal sex, compared to their peers.”
“Age of Sexual Debut among Young Gay-identified Sexual Minority Men: The P18 Cohort Study.” The Journal of Sex Research, Perry N Halkitis, et al., (2021)
https://pubmed.ncbi.nlm.nih.gov/32609010/

“Childhood sexual abuse (CSA) is associated with a wide range of health outcomes and is more prevalent among men who have sex with men (MSM) compared to men who have sex with women exclusively.”
“Age of occurrence and severity of childhood sexual abuse: impacts on health outcomes in men who have sex with men and transgender women.” The Journal of Sex Research, Casey D. Xavier Hall, et al., (2021)

(Pictured: Painting by Karl Vikentievich Lemoch, Russia, 1841-1910.)