I was very late to puberty (16 almost) and had earned the nickname BD in Jr High (BD stood for "Baby Dick" - an unfortunate benefit of gym showers). As a result, I ended up at the "loser table" at lunch and the library - consigned to friendship with the other freaks, geeks, nerds, and losers throughout Jr High and High School.
Despite the labels, we had the same hormones (well, eventually), urges, curiosity, and societal peer pressure of any other teens - it just never occurred to parents, teachers, or non-loser peers that we did - which probably went a long way toward enabling us.
The result was probably as much or more physical and sexual exploration as the popular kids. We spent a lot of time in one friend or another's basement watching science fiction and playing games. Spin the bottle progressed to truth-or-dare to "strip spin the bottle" to role play games ultimately resulting in some form of nudity and light bondage (you are now the king's - or queen's prisoner strip him or her and tie them up!)
Anyway, I was 15 and had just started to sprout pubic hair. I was hanging out over at Ellen's house - I guess she was an early "goth girl" - always wore black and scarves - it was just the two of us that day. Ẁe had seen each other in varied states of nudity before, but alwlays as part of group games, never alone. That afternoon, she wanted to play truth-or-dare. We used to roll dice - even was truth and odd was dare. The first time I rolled for a truth, Ellen asked me if I'd ever seen a girl come. I said no, she rolled and I had her do something stupid, then I rolled truth again and she asked if I wanted to see her come. I said yes and she stood up, stripped down to her panties and told me to just watch. She rubbed her hands over body, pinched her nipples several times, and rubbed her hand over her crotch - all while standing about 5 feet away with her eyes closed.
Eventually she slid her hand inside her panties and said "I'm so wet." With that she slid her panties off and continued to finger her clit while never breaking eye contact. After a minute or so, she sat on the couch and spread her knees, telling me to kneel in front of her. She then proceeded to masturbate vigorously, then slowly, then vigorously - spreading her labia to give me a view of her hole and then going back to masturbating. I was mesmerized and can still picture it today.
I remember that she tensed up & cried out loudly when she came - and I almost panicked, thinking that she had hurt herself, grabbing her saying "are you okay? What's wrong? Are you okay?" She called me an idiot and said that's what it's like when a girl comes. She asked me if I liked what I saw. Later, she had me return the favor - which was a new experience for me (but evidently not for her). The first time I ever came was masturbating for Ellen.
We never had intercourse, but over the next couple of years all of us at the loser table explored our sexuality, experimented, and learned. And the cool kids/bullies never had any idea.