Careful there, there are animals who have homosexual relations and primate proto-societies have in fact endorsed double standards of allowing leaders homosexual relations and preventing heterosexual relations of others. (Yes I do have a source on this, but I'll have to make a trip to library next time its open with all this shitty weather over here to properly cite it).
Something has got to give; either our unnatural environments will be destroyed, or our natural upbringings will have to change and adapt to these new highly unnatural societies. Until then we will be doomed to some very messed up people where it counts. (as in people who turn to self destructive or misanthropic methods, not as in stable people with slightly odd lifestyle choices)