Hmm.... But, in a primitive society (say, a group of hunter-gatherers), having a gay member of the group may actually help the group as a whole (and the group will have very similar genes). The gay member would contribute labor and help the rest of the group gather resources, while at the same time the gay member would not be having children (who contribute nothing until they are old enough to take part in hunting/gathering).
If we're assuming that the gay gene is recessive, other members of the hunter-gatherer family group would also carry the gene. Though the gay member might not pass on his genes, the other members of the group will and his contributions will help that passing on.
Hardly.
You don't really believe that do you?