Hi Dr. Betty,
I'm 22 years old and have been masturbating since at least age 3, when I remember getting "caught" by my parents. They encouraged me to explore and do whatever feels best but in the privacy of my own room. Since childhood, the way I've achieved what I think are orgasms is by rubbing my pelvis with a closed fist-- often over clothes, while laying down on my stomach (so my body weight is pressed against my knuckles). No penetration, and the whole thing is usually done within a minute or two (start to finish). I can orgasm many times in one 'go,' yet it still takes very little time at all. I believe they're orgasms-- I wouldn't know what else to call them -- but it's not this earth-shattering, mind-blowing feeling. It just is a build up and then a very pleasurable release.