I went to a strict fundamentalist college during the mid-70's. The sexual revolution was in full swing everywhere except at my school. I dated a girl from my school. The two of us were hot for each other but frustrated that it was difficult for us to find a place where we could be intimate.
We went to motels but they were expensive. My girlfriend had a girlfriend that went to a nearby public university and we visited her on weekends. The dorm at the public university was set up with four rooms of eight girls sharing a lounge and shower room. The public university also allowed members of the opposite sex to stay overnight in the dorms. Often many of the girls went home for the weekend and my girlfriend and I would have a private room.
During one of our visits my girlfriend, her girlfriend, and another girl were in the lounge on a Saturday afternoon drinking. The girlfriend was taking a sex-education class at the university and we all were looking at the textbook. The book just had drawings however, they were very explicit. Our fundamentalist college would never teach a class like this.
We passed around the book and on that page was a drawing of a male stroking his cock, and a female feeling herself. My girlfriend's girlfriend then asked me if I was normal. I told her yes. She then said that I must masturbate regularly because the book mentions that a huge percentage of men masturbate compared to a lesser percentage for women.
I told the girls that according to the book at least one of them masturbates regularly. I went for broke and told the three girls that if they show me how they do it, I would show them how I do it. My girlfriend did not object to my conversation so I took this as a green light.
The girls were hesitant so I told them that if they just take off their clothes they could still watch me and they wouldn't have to masturbate in front of me. There was still hesitation.
The third girl who seemed the most shy said what if they only took off their tops. I said that if they let me touch their naked breasts, I would take off all my clothes and masturbate in front of them. They all said OK. I took off my pants and as I rubbed my crotch through my underwear, I felt the girls' breasts through their clothes. Soon I was naked masturbating in front of three topless girls feeling their breasts.