K for saying what I was going to, and it's not always the parents that pursue the charges.
On We t.v. there is a series called Secret Lives of Women. One of the episodes was about child brides. One couple featured was just such a situation, they started dating when he was 18+, she was 14. The sex was consensual. Big surprise, she got pregnant and (with her parents permission) they married. The twist? Even though her parents didn't pursue a case against him, the state did. The kid served his jail time and got out and went back to his wife and child and is now unable to get a decent job because he's a registered sex offender.
I dunno, maybe there should be categories of offenders and only the potentially dangerous/predatory ones publicly listed? Or maybe certain "crimes" need to be treated as a different category altogether. Lumping an 18 year old who is in love with his 15 year old girlfriend in with a 50+ year old child rapist is lacking in both common sense and compassion.