17 year old dating 14 year old illegal
Also, Once you are 18 it illegal no matter what state you are because you will legally be an adult.
It does and can happen, that if you are engaging in sex with someone under the age of consent.
Your "advise" is incorrect, stupid and dangerous - if these two are having sex one of them is committing a crime and could be jailed and labeled a sex offender. Most adults don't post kisses in their signature line.