Seriously Science - Are there really two kinds of female orgasm? Science weighs in.

There is a long-standing and heated debate in the scientific literature about whether or not there are two kinds of female orgasm. One side argues that orgasms stemming from penetration are fundamentally different from those arising from clitoral stimulation. The other side insists that they are really the same thing, and the only difference is how the clitoris is stimulated. Here, two scientists set out to test these two hypotheses by using ultrasound to track blood flow patterns and determine how the clitoris moves during different types of sex. Their results support the hypothesis that there are, in fact, different kinds of female orgasm. We're just glad they didn't use the acronyms from this study.

Pilot Echographic Study of the Differences in Clitoral Involvement following Clitoral or Vaginal Sexual Stimulation.