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by Traditionally, women are seen as requiring extended periods of foreplay before sexual arousal, as opposed to quickly responding males. Science may not agree, however. Using thermal imaging equipment that can accurately measure temperature changes of 0.001°C within a few square millimeters, researchers recorded raised temperatures in subjects' genital areas while watching pornography. More heat indicates increased blood flow to the area, a tell-tale sign of sexual arousal.
The subjects included 28 men and 30 women who responded pornography with an average increase in temperature of about 2°C. A temperature increase was not observed when the subjects were exposed to comic or horror movie clips. The men reached peak sexual arousal in an average of 665 seconds, while women arrived at maximal arousal in 743 seconds, the difference being not statistically significant.
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MRI and more.. by AdamWysokinski :: NR5 :: Show
There are several very interesting studies on that important topic. Several years ago an MRI was used to make images of male and female genitals during coitus and female sexual arousal. You may read it here (images included): pdf or html. Functional magnetic resonance (fMRI) was also used - both for women with spinal cord injury (Functional MRI of the Brain During Orgasm In Women) and for healthy ones. And as you can see, the results of the last study may be used to build this so-über-nerdy-orgasmometer (if only that narrow plastic bed of an MRI machine won't be disturbing you) ;-)