Teen Pregnancy, Car Crashes, and Student-Teacher Relationships: 11 High School Themes We'll See on TV Forever (PHOTOS)

Bisexuals haven’t always been welcome on television, but now that the celluloid closet door has swung open, many shows have experimented with a character who flirts with both sexes — even if they quickly revert to dating members of the opposite gender.

Marissa Cooper (Mischa Barton) kisses a girl (Olivia Wilde, who went on to play bisexual doctor Thirteen on House) on The O.C. — and she likes it. On 90210, Adrianna (Jessica Lowndes) has tackled every cliché in the book — from teen pregnancy to drug addiction to losing an acquaintance in a car crash — so she was a natural choice for the suddenly bicurious trope. Glee’s Brittany (Heather Morris) loves her girlfriend, Santana (Naya Rivera), but she likes to duet with guys, too.