No state has any laws against dating. Felony occurs when sexual relations take place between an adult and a minor. Each state has different ages on when consent can occur.
There are no laws regarding "dating. " Dating is a matter that parents decide. The law does however set a specific "age of consent," which makes it a crime to have sex with underage individuals regardless of consent.
There is not set age according to the law. However, there is a law that states that adults cannot date minors. It's punishable by law if the couple had sex.
