When I turn 17 I can have sex with anyone I want and my parents can't legally do anything about it?

At 17, unless you are an emancipated minor, you are still the legal responsibility of your parents. Parents are legally responsible for the care, welfare and control of their minor children until the age of 18.

At 17, you are deemed old enough by law to consent to have sexual contact with another person 17 or older. This means, no one will be charged with a criminal sexual offense because no criminal laws would be violated; however, the parents still have legal control of the minor and may use other legal means to control the actions of the minor, or the actions of another as a preventative or protective measure.