The logical solution is to implement a Romeo/Juliet exception to the Florida law/ For example, if the couple is 3 years or less apart in age, then the crime gets downgraded to a misdemeanor or something like that. Other states have these logical provisions.
This thread would have gone a lot easier if the libertarians would conceed three things: Age of consent laws were put in place to protect parents rights to determine what is acceptable for their children, Fifteen is probably on the young side to be having sex, and when a fifteen year-old and an eighteen year-old get together the eighteen year-old is usually the one who initiates sex.