I've got instincts of my own

I decided to condense and express my thoughts on why I (as a gay man) exist

Most primates and early man socialize(d) in relatively small to mid-sized family groups, with hierarchies of male and female dominance. I've heard before that younger members of large families have a higher tendency to be gay. If you assume that developing children take stock of their situation (all unconsciously, of course) and somehow a sexuality is decided, it might actually be to the advantage of some of the children to not procreate. This is because in a limited-resource environment, too many members of a group trying to procreate will actually result in a reduced child survival rate because too many will starve, and any low-standing individuals trying to procreate will be injured by the dominant members of the group.

Since many of the members of the group share a certain portion of the same genes, it could still be evolutionarily advantageous for such individuals to concentrate their efforts on the other children of the group, rather than trying to have their own. The attraction to the same sex could just be a redirection of sexual energy.

This is all based on the idea that there is no such thing as a "gay gene," which I don't think could possibly exist anyway because it would be self-defeating, considering that any animal in which it expresses itself would not procreate.

And of course I could just be talking out of my ass and making this all up. But it makes sense to me. Unfortunately, I'm too lazy to actually look for research backing any of this up.