Thank you Frank Wartenberg for the pic.      

Sex may not actually burn calories, but that's no reason to give up on it.  A report published on Jan. 31 in the debunked the notion that sex is a good way to burn calories. According to researchers found that the only evidence supporting this claim was a study conducted on 10 men in 1984. This study found that sex lasted six minutes on average and burned only 21 calories.