Again, if there is/were to be a gene for homosexuality, it would ONLY persist in the population because it was allowing some people who carry the gene (for example, the relatives of a homosexual individual), to reproduce more than others. Not because it benefited the population in general. You can't separate natural…

Trurl, the sickle cell gene only exists because it increases the survival rate of individuals. Somebody in a malaria-prone area with one copy of it is likely to have greater reproductive success than somebody with zero copies of it. The only means a gene has of affecting a population  is by affecting the fitness of…