Romeo and Juliet: this applies to consensual sex between two minors. Marital Exception: Oklahoma allows for consensual sex between a minor and an adult when they are married. There are two exceptions to the age of consent laws in the state of Oklahoma. Exceptions to Age of Consent Laws in Oklahoma The age of consent is the minimum legal age at which an individual (male or female) has the mental capacity to consent to sexual intercourse with another individual. This means it is illegal for a minor who is 15 years old or younger to have sex with an adult who is 18 years of age or older. In the state of Oklahoma the age of consent is 16 years of age.