Wasn't a bloke convicted of ****ing of a Dolphin a few years back? (the Dolphin refused to press charges)
http://www.telegraph.co.uk/news/uknews/6671012/Man-with-sexual-fetish-for-slurry-jailed.html I'll say no more.
"Once comfortable, though, females initiate a series of muscular vaginal contractions that rub the entire length of your member. They may also thrust rhythmically against you, so enjoy the experience while you can, since you will rarely last longer that a minute or two. Just prior to her climaxing, she will up the speed of her contractions and thrusts." i might have to give this a go.
Now I can see where Bowie got his inspiration from................... "I, I wish I could shag, like dolphins, like dolphins can shag..........................