The Influence of Sex on Dieting

An experiment on the affect sex has on diet. Yeong-gyu and Tae-joon are making a documentary. The first week, they have sex once with one woman. The second week, they have sex twice with two women. The third week, they have sex three times with three women.
Regardless of nationality, marriage or past?! Where is the end of this reckless project that goes on for 3 weeks with 6 women?