Re: where is it?
Ejaculation can occur with prostate stimulation.
The prostate is a few inches in your rectum, and you can find it by sticking your finger in your ass. When you feel around enough, you should feel a ball/roundish shaped thing (sorta like if a golfball was stuck in the wall halfway), and that is your prostate. When you jack off and stimulate your prostate, it gives you a very intense feeling that some guys practice very often!
You can look this up on Google for more info, like "finding your prostate" or something like that.
I think this should go in puberty for boys