I discovered masturbation at around 10 or 11 and have enjoued it ever since. I am now 45 and it has always been an exciting and fun part of my sexuality.
Where I grew up there were always alot of kids around, both boys and girls. When I was 13, one of the girls my age started teasing me about how she changed her little brother's diapers and she knew what boys looked like 'down there' and did I know what girls looked like. I told her yes since I had an older sister. The truth was, I had not really seen my sister naked since we were very little, despite trying repeatedly. By the fourth time she did this I finally said, why, do you want to show what you look like, expecting that to put an end to it. Much to my shock, she said maybe. She went on to tell me she had overheard her oldder brother talking about jerking-off and she wanted to watch. I turned purple from embarassment and denied I did it, ending our talk.
Several days later she approached me again about watching me. I had thought of nothing else almost the whole time, masturbating numerous times over the idea. She told me she would let me look at her first if I let he watch me. I agreed this time, although I was so nervous I was shaking.
We went to my house, as my parents worked and my sister didn't get home from high school until much later. We went up to my room and faced each other. I told her to ahead and take her clothes off. She wanted us to do it at the same time, so when she started pulling up her shirt I did the same. My cock was poking out the front of my pants by this time. Once we were naked she sat on my bed and spread her legs for me. She told me to get closer so I could see. Her hairless pussy looked wonderful to me. I wanted to touch her but was afaid she would get mad, but she took her hand and pulled my hand down to her pussy. I was surprosed to feel the wetness, since I knew nothing. She guided my hand up and down her slit for a couple minutes until she shuddered and seemed to relax. I had no idea girls orgasmed or how, so it wasn't until later I realized what happened. Looking at me she said it was my turn. I knew it wasn't going to take long, as I began to pump my cock. I think it took about 4 or 5 strokes and I came, shooting onto my leg and getting some on her leg also. Unfortunately, I came before I got her to touch me. We cleaned up and left.
We repeated that through most of 8th grade and the summer until we went to different high schools in the fall. From that point on I always enjoyed masturbating with other people, mostly female, but a couple guys too.