My interest started purely visual. I really wanted to see a woman piss, up close and fully displayed, her stream flowing from her clearly visible pee-hole. Yeah ... I'm very voyeuristic. But I was too embarrassed to ever ask.
Then, after college, I had a girlfriend who suggested we take a hike in a nearby park on pleasant afternoon. After an hour or so, a long way from the parking lot, she said she was going to have to "tinkle". We hadn't encountered too many others, but occasionally other hikers had gone by, so she wanted to get off the trail and wanted me to go with her as a "look out." My dick got hard, just from the anticipation. She found a spot, dropped her shorts and panties to her knees, squatted down beside me and I saw her stream shoot out from between her legs. She didn't seem concerned about me watching at all, so I took a couple of steps forward so I could glimpse her slit as she continued to pee. She wasn't kidding about having to go. When she finished, she just pulled up her panties and shorts and off we went, as if nothing had happened. Except my dick stayed hard for a while.
That night, when we were having sex, I told her that watching her pee had really aroused me. She looked at me strangely and replied: "Honey, you eat my pussy, and very well, too. I suck your dick, all the way. I don't think it's a problem if you want to watch me piss. Any time I got to go, it's fine with me."
From that invitation, we both explored the different aspects of pee play. After awhile, it became another easy choice on our erotic menu. But I have to admit, I still like to see the ladies who are exhibitionistic about peeing, which is a nice thing about NN. Think about it. A woman who will pee openly for an appreciative audience is being delightfully naughty, extremely playful, thoroughly uninhibited, excitingly exhibitionistic, a little kinky and wonderfully intimate (If you're a couple, everyone assumes you're fucking; but enjoying pee play is your secret.) I find that to be a powerful erotic cocktail!