Nonetheless, there is a lot of interesting information on various penes in the animal kingdom. I'm told you can only tell harvestmen from daddylonglegs spiders by the presence of an invertebrate equivalent of a penis... hyena females have a sort of female penis due to hormone oddness... marsupials basically having a split penis, snakes having two penes, walrus having a penis bone, pigs having corkscrew penes (with the females bearing a matching corkscrew vagina!), and so forth. If I had more reference material I'd try to incorporate some of this in, but everyone else go nuts (no pun intended)