Well, this is tricky. A US-made fake-virginities and slut-shaming movie with actors much older than they should have been... Nevertheless, we still recommend you watch Easy A (2010, Will Gluck).
It won't give you any answers but might serve to start to talk about the meaning of virginities and the I'm-not-a-prude-but-not-a-slut-either paradox, about rumors and LGBTQI bullying, about the roles that parents and friends should have in our lives, about sex work, about the counseling services available, the hard-core morality (anti-choice, broadly seen) groups... almost all of the (youth) sex-related issues present in our daily life and discussions.
Use this a conversation starter with yourself or your youth group. Easily digestible and mainstream while packed with ideas for discussion.
A big + for the movie - although slightly out of the believable age group - is the amazing Emma Stone.