I mention this only to point out that from an early age, I had seen the female form many, many times, so the differences in what us guys had and what the girls had was no real mystery. Likewise, not so much in a sexual way, I found the penis far more interesting to look at, simply because we were all at least slightly different in appearance. I always seemed to have an erection when we played these games; my recollection is that usually my friends did not.
So at about the time I really started to find interest in girls, I was in probably the sixth grade or so. I actually had a girlfriend in my class named JoAnn, but she lived far enough away that she had to ride a bus and therefore, our only contact was in class. Her best friend was named Peggy. I even remember her last name and what she looked like, though I only have the vaguest of memories of what the girlfriend looked like. Peggy lived close to the school and so it was not uncommon that I would see her on weekends or after school.
There was a group of us kids ranging in age from 5th to about the 8th grade who were hanging out at the base swimming pool one weekend when someone suggested we walk over to a nearby park and hang out. I don't recall that we were hidden from view, but instead we were just away from other people when someone suggested a game of truth or dare. I don't recall the boys to girls ratio, but Peggy had somehow joined our little group and there had to have been at least one more girl playing the game.
The details are somewhat sketchy but I do recall that at some point I was supposed to kiss Peggy but I pointed out that I had a girlfriend and kissing Peggy was not possible. So instead of kissing, the others had suggested that as an alternative, we had to show each other our privates. I gladly whipped out my fully erect dick and let everyone take a nice long gander. Aside from Peggy, the rest of the kids had surely seen my dick probably a hundred times, so it was just not a big deal for me.
Peggy was wearing a bikini and after seeing how I had just whipped out my dick, she giggled and lowered the front of her bikini bottoms to reveal a small bush of pubic hair. Regardless of age, I doubt any one of the guys in our group had ever seen a female with pubic hair outside the pages of a Playboy. The viewing lasted only seconds but the game we were playing was over. I don't think people did high-fives back when I was in the 6th grade, but everyone of us had felt like we hit the jackpot and there was much hooting and dancing around before we went back to the pool.
I never did get another view of Peggy and there was never any word about the game we played to her best friend and my girlfriend, JoAnn, but we often shared a knowing giggle while at school.