Thirty-something Brandon Sullivan (Michael Fassbender) is a New York yuppie. He is also a sex addict who thinks about sex all the time when he's not having sex. He surfs for porn on his work computer, masturbates often even in his office's men's room, and eyes strange women in whatever situation he's in in the hopes of having quick anonymous sex with them. He hides his sex addiction from those few people in his life who he lets in in an emotional sense, unlike his married boss, David Fisher, who is open about his marital infidelities to his male work colleagues. And the act of sex holds no emotional connotation whatsoever for Brandon. The arrival back into his life and his apartment of his sister Sissy Sullivan (Carey Mulligan), from who he was estranged due to the emotional baggage associated, changes Brandon's life, especially in what he can do in what used to be the privacy and sanctity of his apartment.

Subway Station, 28th Street and Broadway, Manhattan.

Brandon's Apartment, 9 West 31st Street and 5th Avenue, Manhattan.

West 31st Street (btw Broadway and 5th Avenue) Manhattan.

Broadway and West 31st Street, Manhattan.

7th Avenue and West 31st Street, Manhattan.

Delancey Street and Essex Street, Manhattan.

Washington Street and West 13th Street, Manhattan.

Standard Hotel, 848 Washington Street and Little West 12th Street, Manhattan.

West 28th Street and Broadway, Manhattan.

East 28th Street and 5th Avenue, Manhattan.