I've always liked watching females pee but there was a long lapse from 7-8 years old with neighborhood girls playing doctor and most recently two 50 something beautiful women peeing for me to watch.
The first was a redhead. I dried her back when she stepped out of the shower. She announced that she had to pee. I asked to watch. To my surprise, she said okay and sat down on the toilet with her legs spread wide apart. I asked her to hold her labia apart so the pee would make a crisp stream. To my surprise again, she did and I watched her empty her bladder as the nice stream appeared under her clit. As I knealt down, I balanced myself my putting my hands on her knees, which also ensured they would stay spread the whole time. She allowed me to wipe her after she finished. Wonderful.
The second recent experience was photographing a nude model on location. She looked me in the eye and announced that she needed to pee. We were alone so I casually asked if I could watch. She said, sure, and proceeded to squat with her legs splayed wide open. Without my asking, she reached down with her right hand and spread her labia and let the pee pee fly. Very erotic with her smiling up at me. I had Kleenex nearby and asked if I could wipe her. She said, of course. So I gently and lovingly patted her hairless pussy dry and wiped some pee from her anus -- a bonus for me.