http://www.snopes.com/risque/juvenile/corpse.htm
[Collected via e-mail, 2002]
A friend of mine essentially told me the following story. He says he knows a girl whose sister is a real slut. She's at a party and meets a guy, and winds up giving the guy a blowjob. They part ways. Two days later, she's developed a rash around her mouth. She goes to the doctor and he takes some samples and tells her to find the guy. She goes back to the house where the party took place, and the guy who lives there tells her her boy's at work, and gives her the address. When she gets there she sees he works at a funeral parlor, but there's a big funeral going on, so she decides she'll contct him later. That night she gets a call from her doctor. He tells her that the rash is caused by a kind of louse that is most commonly found in the bodies of the recently deceased. When she goes to confront the necrophiliac the next day, she is told that he has died of an untreatable parasitic infection.