No Strings Attached (2011)

Natalie Portman, Ophelia Lovibond, Cary Elwes, Nasim Pedrad

Occasionally in the 15 years since summer camp, Adam and Emma cross paths. When he discovers that an ex-girlfriend is living with his dad, he gets drunk, calls every woman in his cell phone contact list, and ends up passed out naked in her living room. By this time, she's a medical resident in L.A.