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The scientists conducted neuroimaging scans of men's brains before, during and after orgasm and found that the prefrontal cortex, the area associated with consciousness, alertness and mental activity, simply "switches off" after an orgasm.The process is associated with release of chemicals such as oxytocin and serotonin which have a pronounced sleep-inducing effect.The Daily Mail also reports a survey of about 10,000 adults by the organizers of The Vitality Show, that found that eighty percent of men say they feel better able to drift off after sex, compared to just 46 percent of women. Neil Stanley, of the University of Surrey, concluded: "As frustrating as it is for most women that their male partners just roll over and fall asleep after sex, men aren't entirely to blame.

The new study finds an excuse for men, saying they just need to rest after sex.

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According to a new study, the male brain is designed to "switch off" immediately after an orgasm.

The study, published in the journal Neuroscience and Biobehavioral Reviews, says that ejaculation is associated with decreased activation throughout the prefrontal cortex.

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