Sex for weight loss? Tips that may not work

Sex -- not that people do it to try to lose weight, but claims that it burns 100 to 300 calories are common. Yet the only study that scientifically measured the energy output found that sex lasted six minutes on average -- "disappointing, isn't it?" -- and burned a mere 21 calories, about as much as walking. <span class=meta>(AP)</span>
January 30, 2013 2:18:33 PM PST