>>508354296It's only gross if yellow. Before pissplay you must hydrate until your piss is just body warmed water
And it's hot because of the psychological association with release/marking/etc, and the feminine erotic association with wetness, squirting and such. Fluid from genitals. The feeling of being horny feeling like the need to pee.
Men get to see semen fly from their penis in orgasm, so a woman who wants similar visual stimulation and the feeling of fluid release in the throes of unhibited ecstasy may enjoy watching a shower of pee spray from between the wet sounds between their legs as they cum.
Being able to see the strength/vitality of the area of your body where your genitals are. How far/strong you can pee.
Claiming/marking/degradation like in the OP. I like to pee on trees when I'm horny.
Making a mess of yourself in a sexual haze. Water droplets from your pussy all over your legs. You ever see animal mating videos and how elk or deer or whatever are always pissing on themselves in between fucking females?