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Is brain activity during an orgasm different from the period of intense sexual arousal that immediately precedes orgasm? Does it make a difference whether the woman masturbates or is stimulated by a partner? The data that mapped brain activity to levels of sexual arousal culminating in orgasm were gathered in an environment that few would consider conducive to erotic activity.
Functional magnetic imagining scanners are always noisy and usually cold. The women were asked to have two orgasms brought about by clitoral stimulation while their brains were being scanned.
One orgasm was achieved through self-stimulation and the other through stimulation by a partner who accompanied the woman to the lab. In both cases, the women signaled the investigators when stimulation began, when orgasm began and ended, and when she felt she had physically recovered from her orgasm.
Half of the women began with self-stimulation and the other half began with partner-stimulation. Only data from the first orgasm were analyzed for technical reasons.
Fourteen women volunteered for the study. Two were eliminated because they did not experience an orgasm and two others were eliminated because of technical problems with their fMRI scans.