B.C.
Try looking here:
Dating itself is not a problem, but I get the feeling it's sex you are worried about.
Age of consent for marriage for Florida:
"The age of consent is eighteen. With parental consent, parties can marry at age sixteen and parties under the age of sixteen can receive a license by reason of pregnancy or the birth of a child. However, this parental consent is not required if the minor has already been married. Common law marriage is not recognized."