I only orgasm when I'm on top and as someone said it's not really from the penetration but from the rubbing on my clit during intercourse. Even then, if I have another orgasm within about 12 hour period of time, I can't do it again through intercourse and instead get my 2nd one from oral sex, or manual stimulation from him or me. And...it usually takes me a few times when I'm with a new partner to be more comfortable and able to do it.