I think there's a bit of knee-jerking here. Your boyfriend would technically be guilty of rape, because as a minor you cannot be deemed to have consented. Depending on your and your parents' reaction to the situation and your boyfriend's attitude, he'd be unlikely to go to jail. If he were to deny all responsibility, for instance, if you really did feel you were coerced into sex or if your parents wanted the full weight of the weight of the law brought into force, then yes, jail is a possible punishment. On the other hand, if you were all 'grown-up' about it, all parents and boyfriend supportive and responsible, then the law is likely to be a little more lenient with him. I doubt he'd get away scot-free, however.