I was under the impression that animals only engaged in homosexual activity only if there are no other animals of the opposite sex around....
It depends on the species. Some appear to engage in homosexual conduct for a variety of reasons and lacking opposite sex partners appears to be low down on that list for some of them.
you are correct, this is POLITICS trying to be a force in real science.
If anything when there is a shortage of the opposite sex, it would probably cull those least likely to reproduce and continue the species into the future. (at least until the next mutation or shortage)