The time I remember most ....
Maybe lots of girls find it a turn on to watch a guy, certainly there wouldn't be many these days under 30 years old that would immediately avert their eyes in chaste shock.
My story. On a skiing trip, aged 15, my two roommates and I started playing a girls-against-boys game of a well known board game with three girls from a different school and in the year below us. To add some fun, and with no real intentions to go very far, we decided to amend the rules and play 'strip pursuit'. Each time one team got a 'piece of cheese', someone from the other team had to take something off. We had to decide who would strip from each team by shaking the dice, and I got the short straw.
It turned out the girls were cleverer than the boys and it wasn't long before I was down to my jeans and boxers. When they got their fifth piece I started to protest and try to back out, but my friends thought it hilarious and the girls were determined, so I had to carry on. I somehow managed to remove my boxers from under my jeans while the girls got more and more excitable. When the inevitable moment came, I point blank refused. The girls wouldn't accept it and feeling cornered, I said I was too embarrassed to take the jeans off in front of my mates (which was true). Calling my bluff they demanded I go to their room, and with my mates still laughing I set off down the corridor. Part of me was still trying to think of a way out, but another part was growing very hard at the prospect.
Once we got in the room they locked the door, and sat in a row on one of the beds, about five feet in front of me, still pretty much fully clothed. There was another girl in the room that I hadn't met before, but she was well up for it and joined them on the bed.
Trying not to shake with the adrenalin and excitement, I started to take my jeans down. The biggest turn on was the girls' eyes, which were just fixed on my crotch, and wide and wild in the sexiest look of anticipation. They had stopped giggling, and I began to feel a massive surge of confidence and, I guess, testosterone. I made some comment about being so turned on that I'd have to go to the showers to come. The boldest girl said I should do it in the room, and I didn't need a second invitation. I brought myself to a slow intense orgasm in front of them, watching them all the time.
I sometimes think that if we'd been older something more would have happened, but I don't think it would have been so sexy if it had.
My mates were jealous, but I think they weren't ever really sure I'd gone through with it. I think it's affected me, as since then I often fantasise about doing it front of a girl again. The sexiness of doing it is all in the reaction of the girl, her wanting to see you and choosing to watch. It's not in some male power trip, or wanton exhibitionism. At least not for me.