Just two cents. 

The latest and largest genetic studies on LGBTQ+ sexualities (ca 2019-2023, half million people involved) have **made clear that actual genetics play a lesser role** which on top of that is indirect, ie **no gene(s) related to sexuality per se, but rather to general tendencies like risk-taking**. 

> There is no single gene responsible for a person being gay or a
> lesbian.
> 
> That’s the first thing you need to know about the largest genetic
> investigation of sexuality ever, which was published Thursday in
> Science. The study of nearly a half million people closes the door on
> the debate around the existence of a so-called “gay gene.”
> 
> In its stead, the report finds that human DNA cannot predict who is
> gay or heterosexual. Sexuality cannot be pinned down by biology,
> psychology or life experiences, this study and others show, because
> human sexual attraction is decided by all these factors.

[There is no ‘gay gene.’ There is no ‘straight gene.’ Sexuality is just complex, study confirms](https://www.pbs.org/newshour/science/there-is-no-gay-gene-there-is-no-straight-gene-sexuality-is-just-complex-study-confirms)

So really there are many and diverse ways sexuality plays out and evolves  (like any sufficiently complex social behaviour) and there are both [social constructs](https://en.wikipedia.org/wiki/Social_construction_of_gender) and [choices to be made](http://www.queerbychoice.com/), almost all over the place.