A young girl goes into the doctor's office. She says, "Doc, I'm getting married and I'm a little inexperienced, so I'd like to ask you a few questions." He says, "All right."
She says, "All right...what is that thing that hangs between my fiancé's legs?" The doctor says, "That's the penis. The male organ, the penis." She says, "Okay.
And what is that big red knob at the end?" The doctor says, "That's the glands. The head of the penis, the glands." She says, "Okay. And what are those two round things, about twelve inches behind the head?" The doctor says, "Well, lady, I don't know about your fiancé, but on me, they're the cheeks of my ass."