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Sex has in impact on muscle tone, heart rate and the whole body works out during sex. A research in 2013 has come out with the conclusion that a man usually burns an average of 101 calories per session, and women burns 69 calories during sex. Kristin Mark, who is a director of the Sexual Health Promotion in the University of Kentucky, USA, said that body releases a hormone called Prolactin after orgasm, which gives relaxation.
