It's down now but I found a copy of what was there. If you've never seen this, you've missed one of the great moments of the Internet. It's at http://www.sexwork.com/family/dolphins1.html , and keep in mind that this guy was supposedly serious.
Favorite quotes:
"WARNING! In the considerations of safety, you should NEVER let a male dolphin attempt anal sex with you."
"Dolphins have very muscular vaginal orifices, and can use these muscles to manipulate objects and carry them."