I'm 19 and my girlfriend is 16, is it illegal for us to have sex?

If both parties are under the age of 24, in Florida the age of consent to have sex is 16. This means that as an adult, you would likely NOT be charged with any sexual offense; however, at 16, the girlfriend is still a minor under the legal authority of her parents. This means, the parents are within their legal rights to object to the relationship and take legal action, if necessary, against the 19 year old adult to prevent the relationship or sexual act from occuring. Aside from the sexual offense laws, there are other laws that may be used against the 19 year old as a protective measure. It really depends on how motivated the parents are, and how well they know their rights.