does Natural selection prove you are not born gay and christians are right it's a

[October]

Being born gay does not necessarily mean that it is inherited. It is believed that certain conditions in the mother's womb can make

effect a baby's sexual orientation.

[Boo]

How could a gay gene be passed on?
Easy.
It could simply cause a high level of interest in having sex with men, resulting in women who carry it having many offspring. Some of the offspring would be females, who would inherit the gene and go on to have lots of sex with men, resulting in more offspring yet. Some of the offspring would be males, who would inherit a high level of interest in having sex with men. Some of them would only have sex with men, in which case they would not pass along the gene, but so what? Their sisters would pass it on, so it would continue to exist in the population. Some of those men, however, would have sex with women because of social or other pressures (since the gene would not preclude an ability to have sex with women) and they would pass the gene on to their children.
It's not that difficult to figure out how it could work.