The Subway diet. The cabbage soup diet. The junk food diet. From Atkins to the Zone, there is an array of diets to help people slim down. Have you heard of the masturbation diet? You know, the one in which you drop pounds by playing with yourself furiously.
According to Nikkan Spa, a 28 year-old with the alias "Yuichi Ito" was able to lose nearly 9 pounds in two months, simply through watching his diet and flogging his log between three and five times a day. (Supposedly, Ito's record was seven times in a single day.)
While in high school, Ito played baseball, but gained weight after he graduated. The 5 foot 5 inch Ito ballooned to 167 pounds, which would be considered overweight by Japanese standards. Ito decided that a good way to drop the excess pounds was to cut calories and have more sex. With himself.
For the rest of the story: http://kotaku.com/the-masturbation-diet-is-not-recommended-510068862