I have a very sensitive problem. On two different occasions, I've had an unwanted orgasm in public. The first time, I was chatted up by a pretty girl in a bookstore (fortunately, it happened after she left the store, not while I was talking to her). The second time was on a crowded subway because of my proximity to a very beautiful girl. I didn't get off so lucky this time and it was very embarrassing. When I masturbate, it doesn't take me very long to come. Does anyone have any advice on how I can get some control over this?

Really tuned into life. :D

Practice holding back mentally-read about male sex in the eastern tradition to learn how to hold back in a healthy manner.

When you masterbate try to focus on no tejaculating instead of ejaculating. You might be able to build up some resistance.

Fast ejaculating will be an issue later in life... I do not know if you have spoken to a doctor, but I urge you to do so.