Didn't think I would ever say that I get what Milo is trying to say cause I went through a similar situation (although I am straight) but here we go.
First of all, for the record I DO NOT Condone it, I am straight and I never engaged in gay activities. I draw those lines so we can make the distinction.
Anyways, my puberty hit me hard and early when I was only 11 years old. By the time I was 14, I had a full beard and looked at least 17 - So much so, that all my friends were at least 3 years older than I was and they still remain my closest friends. One of them is going to be best man at my wedding.
Continuing, I knew at 13 exactly what I wanted. I was attracted to women and I wanted women. So, I went for it - I went after a 23 year old so viciously that she eventually accepted and we did it, more than once. It was my choice, I was fully aware, I had done a research of two years, it was consensual. I was 13 but I felt like 18.
I played basketball, and every opponent coach thought I was older than I actually was. So there you have it lol.