Too bad I wasn't one of the subjects of this one... I'm all for helping out science:

New research indicates parts of the brain that govern fear and anxiety are switched off when a woman is having an orgasm but remain active if she is faking.

In the first study to map brain function during orgasm, scientists from the Netherlands also found that as a woman climaxes, an area of the brain governing emotional control is largely deactivated.

"The fact that there is no deactivation in faked orgasms means a basic part of a real orgasm is letting go. Women can imitate orgasm quite well, as we know, but there is nothing really happening in the brain," said neuroscientist Gert Holstege, presenting his findings Monday to the annual meeting of the European Society of Human Reproduction and Embryology.

Researches found this was also the only time when women didn't have the urge to ask their partner, "Honey, what are you thinking right now?" Work on the fake orgasm detector is said to still be in progress, and it will be several years before they hit the market.

Holstege said he had trouble getting reliable results from the study on men because the scanner needs activities lasting at least two minutes and the men's climaxes didn't last that long. However, the scans did show activation of reward centers in the brain for men, but not for women.

Reward centers? Had he just given her some jewlery? You'd think from my cynical nature here I was married or something.