So, at certain points in the past my roommate was a bit more sexually promiscuous than he is now--namely, in high school and his first to years of college. One night he had met some girl at a party and ended up going back with her to her parents house. He was a horny teenager, so he, natch, had no complaints. So him and this girl started 'gettin' down' so to speak, but my roommate couldn't help but notice that the girl's dog was just sort of sitting in the room, watching. He found it kind of weird, but once again, horny teenage boy + horny teenage girl = pretty much nothing can stop the action. So they did the dirty deed, and afterwards they were just sort of sitting their, naked, on top of the covers. The dog was still there.
All of a sudden, the dog jumps on the bed and licks my roommate's dick-- he sort of freaks out and has no idea what to do-- pushing the dog off the bed he jumps off and pulls his clothes back on. "I have to go."
I don't think he's spoken to the girl since, but he's always extra careful that there aren't any animals in the room whenever he gets down to business now!