A man and woman briefly kiss
It is mentioned that a man performed oral sex on another man.
^ The video shown of a teenage girl having sex is arguably a sexual assault. The man she is "having sex with" is earlier told on screen that the girl is "passed out" (drunk), goes to find her, is shown "having sex with her", and then spreads the video throughout their high school. This part of the plot is clearly a traumatic experience for the teen girl, who is a main character in the film.
A video of a teenage girl having sex is shown and discussed. The girl is only shown from the neck up.