Don't do that... Don't ever save that virginity because I've read dozens of doujinshi about the girl's virginity is robbed by her upperclassmen in college and she hooked to sex with him instead of her lover
Is fine that he wants to be responsible, but she will be having a really difficult time in college if he gets pregnant now.
They should have tried anal sex, or actually went with the contraceptive combo of condom and pills.