You shouldn't take someone's virginity if they are underage.
Ken was dating a girl that was underage when he was nineteen.
Ken wants to have sex with the girl.
Ken waits until the girl is of age to finally have sex with her.
Ken takes the girl's virginity when she is still a minor.
Ken and the girl are able to have a sexual relationship as consenting adults.
Ken is arrested for the offense and has to register as a sex offender.