Copulating letters, erotic ligatures, the provocative use of blackletter and the well-hung "H": learn about the pornographic history of typography in this fascinating article by Max Bruinsma, which made the blogrounds when it was first published a while back and is well worth reading (or reading again) if you didn't catch it the first time.
The Erotics of Type (via Coudal - thanks Alice)
"MoveMeMM" by Luc(as) de Groot (Font Fabrik)
"Bukkake" (shareware font @ 1001 Fonts)
"Pornstar" (shareware font @ Fontosaurus)
Sexy Dingbats: 1, 2 (DaFont.com)