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In an experiment involving lab rats, sex was correlated with adult brain growth.
Since previous studies have shown that stressful, unpleasant situations can hinder brain growth, researchers from Princeton University wanted to see if stressful but pleasurable situations -- like sex -- would achieve the opposite effect. So, they divided male lab rats into three groups: The rats in one group were given sex partners daily, the second group got set up with female companionship once every two weeks and the third group got nothing at all.
The rats that had regular sex showed adult brain growth, as well as an increase in the connections between brain cells. As a possible effect of their larger brains, the sexually experienced rats were less anxious and quicker to eat food in an unfamiliar environment than the un-sexed rodents.
If you can't figure out a way to use this study to get more action from your wife or girlfriend, you really need to be having more sex.
