Wilde kingdom
You and me baby ain't nothin' but mammals
So let's do it like they do on the Discovery Channel— The Bloodhound Gang, 1999
National Geographic may not have quite the same ring, but I think the narrator and music choices just make this video clip:
As far as evolutionary or biological advantages of homosexuality are concerned, Ian once observed something interesting about the simulation game Tribes:
[T]he survivability of the tribe as a whole went up if you had a small number of adults who were involved in procuring food and caring for children, but not producing children.
Dunno if this has any relevance -- Tribes is just a game, and not meant to be gospel. But it's interesting, anyway.