I never thought about this until I started exploring things with a dom, but he's rather good at persuading people that they'd enjoy things they thought they wouldn't, it seems. There wasn't any actual pissing on each other, but he made me choose to either hold it or go in the sink in my room. I chose the sink, but because I was naked and him fully clothed (does it for me quite a bit), and him touching my body and making me look into his eyes, I couldn't go. He made me drink more, then fucked me. I was desperate at this point and kept trying to get away, but he fought me, bit me and twisted my arm up, all while pressing on my bladder, and that was one of the hottest experiences I've ever had. Still not sure if that's because of the watersports element or just the D/s-ness (or if watersports is hot because of its D/s connotations, which seems to be implied by a lot of the posts on here). Similar experiences, guys?