The idea of members of the same sex copulating gives rise to an interesting question.
Why do they do it?
Your probable answer is that it's for fun, and because it feels great, and even why the hell not.
But anthropologists and psychiatrists have always claimed that sex is for procreation, and that the only reason that it's pleasurable is for the continuation of the species.
Well a lot of men enjoy wearing clothes that were designed for women and they put on makeup too, and then when they're done, they go out and find members of the same sex to enjoy themselves with, and they haven't got a single thought of procreation in their heads.
A recent report by a prominent female anthropologist came to conclusion that people simply have sex because they enjoy it, and states that although some couples are trying to have a child, it's hardly ever the main reason.
The report has come under multiple attacks, but I would have thought that its conclusions were obvious.
A transvestite for example, has an operation and takes hormones so that he can physically engage and enjoy other men, and it's highly doubtful that he does it in order to have children.