http://www.condomslogans.com/ i think this site is hilarious. that said, if yer gonna have sex peoples, use a condom! EDIT: some of these might be a little on the dirty side. just givin a fair warning
That was actually a line in a Robbin Williams movie, called something like The World in the Eyes of Garp. Very good movie, by the way. But I doubt this was its origin. Likely, it's a popular saying.