If you take a simplistic view of genetics where you draw Punnet squares and check if the offspring has GG alleles, maybe. Even if there are social benefits to t

If you take a simplistic view of genetics where you draw Punnet squares and check if the offspring has GG alleles, maybe. Even if there are social benefits to there being some gay people around, that would still make those alleles pretty unlikely to be passed on. That doesn't imply there isn't a genetic component. Real genetics is a lot more complicated than that. The fact that something is genetic doesn't imply there is no social component. Genetic factors could lead to a predisposition for a certain behavior that would still be altered by environment. There could be many genes that each has some small effect but none of which is an on/off switch. Those would lead to more complicated selection pressures. We are pretty sure there is a genetic component. We are pretty sure that it isn't just "if you got the gay allele then you's gay". Also, some gay (or mostly gay) people have children. This is because a) most people are at least a little bit bisexual, b) people may want to have children even if the sex act isn't appealing, and c) there are social pressures to conform.