Ok, gotta ask, when you say "orgasm" are you refering to the little feeling of flush pleasure that is accompanied by a discharge? Or a full fledge, teeth rattling, back hurting, bite through flesh orgasm?
From my experiance there are three kinds of orgasm's, a small one, which are quick and pleasurable, but here and gone fast, can have lots of these, mediums which are a bit more of a buildup, but can have alot of these, and the "BIG" one. The big one leaves me laying in the bed, in minor convulsions, as I recover.