http://www.theregister.co.uk/2009/12/09/friends_with_benefits/

http://www3.interscience.wiley.com/journal/123203589/abstract?CRETRY=1&SRETRY=0

CONCLUSIONS:  Young adults who engage in casual sexual encounters do not appear to be at greater risk for harmful psychological outcomes than sexually active young adults in more committed relationships.

Qué bueno que está probado científicamente…