[...] Humans have biologically determined inclinations that can manifest themselves under certain conditions. An animal doesn't choose whether it wants to reproduce or not. It is guided by instinct. [...] Can a person give up sex and become a monk? Yes, they can. Can a person not want to have children and become childfree? Yes, they can. [...] That is, humans don't have instincts like other animals. Based on all this, humans aren't innately homosexual, and as you yourself said, their sexual inclinations are shaped by their environment. [...]
This issue of nature versus nurture arguably applies to much of LGBT+ territory (not just gay/lesbian). Venturing into that expansion...
The case of
David Reimer was eventually touted as an example of a boy who "clearly" had an innate orientation to be a boy, even after a circumcision mishap led to surgery and hormone therapy that transformed him physically into a girl. Thereby seemingly debunking the theory that psychologist John Money advocated, that gender identity rested almost entirely in the territory of social learning (David's brother served as a control).
However, it took decades for the medical community to realize that Money had lied or exaggerated about the "successful" results of David's sexual transition, and during that time his fabrications had shaped the policy of sexual reassignment of infants (which apparently accepted that gender identity preference was indeed caused by environmental factors).
Adding further confusion is biographer John Colapinto's later claim that John Money coerced David and his brother into performing sexual positions during appointment sessions. Thus, this could cast a degree of doubt on even the conclusion that Money's theory was incorrect or at least suspect. Which is to say, some of David's intense feelings of depression from being a girl could have arisen from those disturbing encounters in Money's clinical office. In addition to being bullied by classmates for having tomboy characteristics.
Bottom line is that the binary battle over nature versus nurture (absolutely one or the other) is never going to be resolved in that context. The responsible position for a human research community to take is that it is an erratic combination of both, with the statistical "average person" potentially sported in such circles contingently deviating from an idealistically depicted balance when it comes to the anomalies of distinct individuals in the real world.
But I understand that this topic is currently taboo in the West.
Not as politically taboo as it may have once been. Which is to say, decades ago there was arguably moral pressure to assert that gay/lesbian orientation was 100% biological in origin[1] and to obscure the occurrence of sexual fluidity among those who identified strictly as homosexual. This was to enhance the success of agenda or reform. But now that much legislation has been won on paper, there's a more relaxed attitude about admitting multiple "causes". And the postmodern-like refinements (flexibility) being added to the LGBT+ gradient is mind-boggling. Even
asexuality has acquired more sub-categories and varying hues than I could ever keep track of or remember. Doubtless, one could encounter old-timers still locked into past agitprop ("
It's all pre-ordained, and I'm an iron-clad, never deviating ___!"), but that ship has sailed for the more liberal and creatively innovative youth.
- - - footnote - - -
[1] That excludes experimental behaviors and those born in desperate circumstances, as illustrated by unique situations like prisons, seeking new sexual or hedonistic thrills, etc.
_