I want to answer it for my experience only. I grow up in conservative muslim country, all people around me keep saying you can't be born gay. Gay is just a phase. Its not normal how can be man not like woman.
So when i discover that a gay man having sex with woman and enjoy it, i can't accept that he is still gay but he must be bi.
Because if that is true, then all the words of people that keep telling me is right that this being gay is just a phase. That i just need to wait to find the right girl or try to have sex with a woman.
If my people know that gay people can have sex with woman and enjoy it, 100% they will treat gay as a choice more than they did before.