If memory serves, I was 12/13. I had already had sexual feelings, and erections. I thought I had really gone off the rails, because all pleasurable feelings prior had come from my anus!
But, I soon learned about ejaculation from a friend, who, while younger than I was, was already masturbating, and enjoyed demonstrating for anyone interested! Since his parents were family friends I would often stay overnight with him, and rather enjoyed watching, and even helping. Then one night, as much as I tried I couldn't achieve ejaculation, so he took matters in his hands and gave me my first orgasm.
I think a lot of teen boys (and girls) experiment, and even though "jerking each other off" was very enjoyable as we got older we moved into heterosexual or homosexual relationships.
You either are or aren't gay, just the same as your are or aren't anal erotic or you are or aren't turned on by enemas. If you said yes to any of these there is no "therapy" is going to change that, and society should let us be what we are, unconditionally!
One thing that I was not happy about, because I was anal, I was happy to allow him to have anal intercourse with me, but he would never reciprocate. Then, for a short period of time, another friend and I would fantasize about girls we wanted to have intercourse with, then have anal intercourse with each other. At about the same time we started dating girls, and that ended that.
What it did leave me with was a desire to receive anal intercourse, but not be romantically involved with another male.
The only times as an adult I have received anal intercourse from a male was from a fellow named David, who wrote an enema book, when I would travel to New York City. David gave some of the best enemas I have ever had! So while I could not have taken him in my mouth, I was quite happy for him to take me in the ass! Thinking back to the time this was going on that was some pretty risky sex!
So, I really got off topic here, but it does relate to the sexuality of people here!
No one should ever be judged or ridiculed for their sexuality. I was outed to the community a few years ago because of my enjoyment of enemas, and I consider that one of the cruelest things anyone ever did to me. I was always happy to out myself to some friends and lovers, but to have someone do it to damage my standing in the community was devastating.