LOL Well, you guys have a thread named vagina...I thought it was only fair to start a thread called penis!
Now for the heck of it, let's throw wikipedia's definition of a penis!
The penis (plural penises, penes) is a biological feature of male animals including both vertebrates (creatures with a backbone) and invertebrates. It is a reproductive, intromittent organ that additionally serves as the urinal duct in placental mammals.
Jeez...lol is it me or does it seem way more simple than the vagina one?
Anyway, yeah...I suppose there was no point to this thread. Well! I shall make one! If you could find an FTM and go to a doctor, and switch body parts that you both wanted from each other...WOULD YA!?