Sorry. These always turn out to be bogus.No one has ever determined that being gay is genetic. There are pairs of identical twins where only one is gay. And yes, I realize identical twins don’t have EXACTLY the same genetic complement, but closer than any other two people.
If not genetic, then environmental? Such as young boys playing with dolls?
Its actually impossible. If you believe complex sexual behavior in humans is entirely genetic and they do not have a choice then all concepts of morality break down. How can you expect rapists not to rape, cheaters not to cheat, or child molesters not to molest? They were born that way. Its a really bad concept. We know that people can have sexual desires that they choose not to indulge whether it is to honor marriage, chastity, or simply because it doesn’t make sense. How many men haven’t seen a hot babe that they had a physical desire for that they choose not indulge or pursue?
I also have known many people who have moved from one end of the spectrum to the other. One professor in particular had a real problem hooking up with his female students and cheating on his wife then after many years he hooked up with a male student. I know more than one person who suffered sexual abuse as a child. Sex is not a clear thing and the idea of believing that genetics provide a morality free license to do what ever one desires is dangerous.
Identical twins have the exact same DNA because they came from the same fertilized egg. Identical twins do NOT have the same fingerprint, however. Fraternal twins do not have the same DNA.