The Opposite of Sex (1998)

A 16-year-old girl visits her gay half-brother and ends up seducing his boyfriend, thus wreaking havoc on all of their lives.

Director: Don Roos

Cast: Christina Ricci, Martin Donovan, Lisa Kudrow, Lyle Lovett, Johnny Galecki, William Lee Scott, Ivan Sergei, Megan Blake, Colin Ferguson, Dan Bucatinsky, Chauncey Leopardi, Rodney Eastman, Heather Fairfield, Amy Atkins, Leslie Grossman, Emily Newman, Harrison Young, Pancho Demmings