In suburban Chicago, Great Lakes High School seniors Julie, Kayla and Sam, who have been best friends since they met the first day of their school life, are preparing for prom night. The parent that took each to school that first day - Lisa, Mitchell and Hunter respectively - had the potential to match their daughters' friendship, but it has not materialized in quite the same way. Despite brawny, sports-minded Mitchell - who nonetheless is prone to emotional tears - texting her to do things all the time with his wife Marcie, Lisa, the single mom who has devoted her entire being to only offspring Julie, quietly ignores those attempts to be buds for her own personal reasons. Julie and Mitchell don't as quietly ignore overgrown adolescent Hunter's messages, he who they have not kept in touch with since he and Sam's mother, Brenda, split. Hunter has generally been a non-existent part not only of the social circle around their daughters and their daughters' friends, but of Sam's life. Without telling their parents, the three girls have entered into a pact to lose her respective virginity on prom night, each having a different reason for wanting to lose her virginity that night. While Julie wants it to be a special night with her boyfriend of six months Austin, Kayla feels it's a rite-of-passage she will eventually go through, her prom date, Connor, as good a person as any. Sam, still in the closet to everyone, wants to feel part of the crowd and will go along with testing the straight waters with her date Chad, while she truly has her heart for Angelica, who is openly out. As the three couples head off on prom night, Lisa, Mitchell and Hunter learn of their daughters' pact, each who has his or her own reason to try and stop them. Lisa doesn't want Julie to make the same mistake she made with her first, Julie's father - who dropped out of her life shortly after their sexual encounter - that encounter which resulted in Julie. Lisa also does not want to lose Julie, who is the entire focus of her life. Mitchell is not emotionally ready for Kayla to do anything besides the sports related goals to be the best they have worked on together their entire lives. And Hunter, while wanting Sam to have a fun, sexual life, wants her to have it with someone of the correct gender, he deep in his heart knowing of Sam's homosexual orientation. The teen couples and Lisa, Mitchell and Hunter, as two groups, get into one misadventure after another as the parents try to track their daughters and their dates before they feel the girls will be making the biggest mistake of their young lives.