There you are, minding your business in the library when a shy coed approaches you. She shows you a little of the anatomy test she's studying for and admits to being stumped about some of the finer details of the male body. After you kindly answer a couple of her questions, she admits that a visual demonstration might be a little easier for her to remember. You go back to her campus apartment and fill her mouth with an extended anatomy lesson she won't ever forget. ;)