It is illegal to have sex with a person who is at least 2 years younger than you and more so because you (male) are an adult. By law, you can go to jail, even if she consents.
This was shown on a daytime talk show. The guy was 17 and the girl was 16; they were boyfriend and girlfriend. He went to jail. Even if the parents do not press charges, the District Attorney can.
My advice is to check your local, state and federal statutes before you end up in JAIL.