I learned about masturbation when I was twelve, all my friends at school used to talk about it. At first I just used to listen not knowing what exactly they were talking about, I just knew it was related to sex, and I was very interested.
When I turned thirteen I stayed home from school one day and was feeling kind of funny (nowadays I call it horny). I was looking at some girls in a car magazine. I then decided it was time for me to have my first orgasm (by now I was well aware what an orgasm was and had previously failed to have one after many attempts).
I went up to my bedroom and started masturbating really fast, my hand was getting tired, but I wasn't going to give up. I kept trying and trying until finally I moaned so loud I'm sure my neighbours heard (I lived in an apartment and was embarrassed to come out), and a bit of sperm came out. I couldn't believe it. I cleaned myself up and from then on I started masturbating two to four times a day.
Nowadays I still do it but nowhere near as much as I did back then.
I will soon post the story of when my first mutual masturbation experience occurred.