I know my BF loves to watch me pee standing up. I remember when we first started going together we had a friendly discussion about about things a man could do that women could not. And after disproving his various arguments he said that "women cannot pee standing up like a man, without it running down their legs." And I replied that "Some can, even go through the fly".
And after he insisted there was no way I quietly replied that "I can, would you like to see sometime?" It was funny because we were out at a bar and somewhat drunk at the time, but he almost choked on his beer.
Anyway, after a few more hours we returned home and he rushed to the bathroom to pee, while I watched. Afterward he asked if I did not forget my promise and I said ok or something similar but need to be wearing men's Jeans because I cannot do it wearing these ladies Jeans. He said that I said I could pee like a man, but I replied that I can when dressed like a man with loose Jeans with a long zipper fly, and that he probably could not pee through these ladies jeans.
So after I changed to my men's jeans I let him feel my bladder bulge and saw his penis quickly get erect. To get him even more excited I let him zip open my fly and feel my slit, which felt nice as he started to finger me. I touched his little penis and asked if he wanted sex or to watch me pee. I was hoping he wanted sex, because I am never totally sure about my peeing skills and occasionally make a mess, even with lots of practice. But he said that "seeing me pee like a man would be amazing but that I did not have to if I did not want to."
I had almost always peed alone and was nervous to try it with someone watching especially after insisting that I could pee through the fly like a man.
So while he watched I prepared myself, spreading open the fly of my jeans, and pressing the edges down so that, in effect, the lips of my slit protrude through. Then I used my fingers to slightly spread open the upper part of my slit so that the pee opening was totally clear. I can usually pee ok without doing all this but not always, and I did not want to mess up and look stupid. Finally I said something like here it comes, ready or not. Then I gave a forceful push with my bladder muscles. It was awesome, the stream shot straight out and slightly downward just like a guy, except I had to twist and arch my body to aim. And because my bladder was so full it kept going and going until finally I squeezed my sphincter shut near the end to avoid dripping, and wiped my slit with a tissue. And my BF was so amazed and excited that he had an orgasm right there.