I only like to do it in the shower.
I like to watch guys piss anywhere. Maybe I'm envious of being able to aim.
This I really understand and its the same for me. The erotic voyeuristic vision of a woman allowing you to watch her do something that is uniquely feminine is a massive turn on.
Its the fact that the urethra is right in the middle of the vaginal opening. Women normally squat to pee too. Also panties down round ankles and the soft feminine butt cheeks looking like the Top of a heart. Also that very womanly sound a woman's pee sounds like when its a big urgent pee. Guys pee silently but women hiss in a very erotic way.
I'm not into being peed on but an wil! Let a woman do it for her pleasure. I've also peed on women as they've asked me to but I can take it or leave it.
The most erotic thing for me is the very voyeuristic vision of a woman opening her legs the her vulva to be for you and you can see it actually leaving her body .