Charlie is a playboy convinced that it is worthwhile to live only brief relationships, and passionate. The sister’s therapist tries to convince him of the contrary, but Charlie has relapsed. When her best friends start to think I’m exaggerating, propose a bet: Charlie would have to resist at the side of a woman for at least a month. Friends believe that only in this way that she is able to fall in love. It will be at this point, which will be Eva, an intelligent woman and very charming, which will be difficult to resist.