While admiring Lisa's dress, her mom mentions that it was the same dress she was wearing on her first date with her dad. She then speculates that she thinks it was "the same dress I was wearing when we made you!" Lisa cuts her mom off at that point.
During Amber's eulogy at school, one guy express disgust at Amber having died at the prom. He mentions how Amber was "going to let me do her" that night.
Frequent references to sex or having sex. Lisa's prom date, while speaking on the phone with her, says "Wait, we're still going to have sex after the prom aren't we?"
There is a very steamy scene between 2 students in high school. They kiss very passionately, but it goes no further.