From FA:

This is a character concept for a feral based hentai game I'm working on. This would be the main character, the character the player plays as. He doesn't have a name yet, and his species currently has no name, either. His origins will be a mystery in the game until I decide to reveal them, but they won't be revealed in the first game. Maybe if I make a second one or something? I don't know.

In any case, he is unique in that his penis can change into numerous shapes and designs, based on what species he's mating with. His species can mate and breed with any species that is capable of sexual reproduction. There ARE females of this species, which can do the same thing with their vulvas.

I would assume such a creature would be of great use if you are trying to make more of an endangered species.