I went to the zoo

at least I assume it was bird sex since I've never been involved in such a coupling to know firsthand; I've seen my fair share of birds mounting each other which I've always attributed to being as such.
 
I've not seen that. I do know, though, that chimpanzees have humongous testicles, and bonobos (chimp-like apes) have lesbian sex regularly.
 

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