Doing some googling, it appears independently in a number of places but generally apocryphally.

http://forum.rpg.net/showthread.php?377387-The-Etiquette-of-...

http://www.reddit.com/r/AskReddit/comments/jsgeq/would_the_f...

http://techliberation.com/2006/11/07/nipple-indecency-is-com...

If someone could dig up a youtube, that would be great.