Barely Legal (2011) on Netflix

Plot summary

On the birthday the three share, Sue, Cheryl and Lexi always do something special together. Now college freshmen, they turn eighteen and set one aim for the day: to lose their virginity. The three throw a party beside Sue's pool, hoping all of them succeed before the day and night are over. Cheryl has told her friends she is finally going to sleep with Jake, her long-term boyfriend. Lexi is searching for someone she knows only as J.J., who pleasured her the day before from behind, leaving her no face to match the name. Sue, naive and religious, fixes her hopes on Chris, a classmate from her Bible study.