Watersports. First session, girl says she wants me to piss on her so we go to the bath but I can't. Crossing a line? Or because, as she said, I was too hard, maybe. Second session she wants me to piss all over her face while we're in bed. And - being a gentleman - I oblige. It's very hot, especially as she is an adorable, beautiful, sensitive and intelligent young woman who's just into very hard, degrading sex. Sometimes.
Third time was with the phenomenon which was and is Little Katie (see review) and that was again with a very beautiful, bright, warm young woman who's just... (see above).
Never thought I was into puking till Lindsey voided her cider over my cock which was ramming down her throat at the time. Can see the appeal now. (Always liked a lot of gagging, to be fair.)
I love the filthy stuff: but is has to be with someone demonstrably sane and grounded and interspersed with fluffyasfuck gfeness too. It's the contrast between the two that works for me. I think I'd find a girl who was only into filth not nearly so much of a turn on.