>>512908928
>Homosexuals are inherently free riders
We've known for some time now that sexuality is at least partially genetic. Twin studies show that when one identical twin is gay or lesbian, the other is 10-50x more likely to be as well, while fraternal twins have a smaller but significant rate as well. (Because this chance is not 'always', we know that it's not a purely genetic trait like hair color, and instead most researchers now agree that it is epigenetic - genes get activated by environmental conditions such as the hormones present during pregnancy). But how does that work if homosexual people don't have children? Clearly, being gay must fit into evolution somehow, because homosexual behavior is found in hundreds of species. But how?
The most convincing is the kin-selection hypothesis, i.e. the 'Gay Uncle' theory. When our ancestors lived in small family units gathering food for survival, having a childless adult around who is related to you (a 'gay uncle') is an advantage: they can provide extra food to help you grow, watch you when your parents are busy so you don't hurt yourself, teach you skills that will help you survive, work with your parents to fight off enemies, and even raise you if your parents die.
How does help the gay uncle? Well, you share an average of 50% of your genes with your children, but also with your siblings. And you share an average 25% of your genes with your grandchildren and also your sibling's children. If your genes make it impossible for you to have children but also make it more likely for your nieces and nephews to survive, it is a successful evolutionary strategy and the genes that make it likely for someone to have a gay relative will get passed on. You could compare childless gay people to worker bees - they may never have their own children, but they are so useful that they will continue to be produced by queen bees, even though they don't directly lead to more queens.