Very dangerous situation. It is not against the law for an eighteen year old to date a fifteen year old. it is a crime for an eighteen year old to have sexual relations with a fifteen year old. Florida Statute 794.011 lays out what is considered a criminal act. Under the statute, willingness or consent from the minor is not a defense. it is a very serious charge, with severe penalties. Certainly, it is not the ideal situation for either parties, or the parents of those respective parties.