It is mental. I’ve discovered why men can become gay and why women can become lesbian, in addition to bisexuality and all that. And let me tell you, ALL deviant sexual behavior stems from the same thing really. It’s hard to explain and it’s SUPER complex because there are so many variables on this to where I can write a research paper. But basically, it when you combine combine the social aspect with the biological one. It’s ALL nurture, all of it. Don’t listen to what anyone else says. The exact reason for it might be unknown though, but it’s akin to the butterfly effect.
But yeah, pretty much all deviant sexual behavior stems from mixing the social aspect with the biological. I can’t explain this right so you probably don’t understand what I mean, but it’s kinda like misguiding your nature. And it’s very gradual, it’s not sudden. It happens and gets worse over time due to certain variables.