Sugar (2004)

Cliff receives an unusual 18th birthday gift from his younger sister — marijuana, alcohol, a subway token and the mission to lose his virginity. This results in Cliff meeting a young street hustler named Butch. At first, as Butch introduces Cliff to gay street life in Toronto, Cliff is excited by his new relationship. But as the two grow closer, he finds that Butch has problems, including drug addiction, that are cause for serious concern.