Ejaculation during sex causes the release of a hormone called prolactin,which increases sexual satisfaction and decreases sex drive. High pro-lactin levels cause weight gain, so some researchers speculate that sexual intercourse makes people fat. Dr.Stuart Brody from Scotland countered that the energy cost of sex exceeds the fat-promoting effects of increased prolactin. Frequent sexual inter-course is linked to fewer heartattacks and less body fat.Masturbation does not reduce the risk of heart disease or obesity; so get as much real sex as you can.
(Medical Hypotheses Journal, 71:812-813, 2008)
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