Under CA law, Penal Code 261-269, "Any person who engages in an act of unlawful sexual intercourse with a minor who is more than three years younger than the perpetrator is guilty of either a misdemeanor
or a felony, and shall be punished by imprisonment in a county jail not exceeding one year, or by imprisonment in the state prison." The law also defines an adult as someone who is 21 or older. Thus, while the age of consent in CA is 18, your son is within the 3 years older part of the statute for no charges to be brought.
Thus, it is still up to him, as he is over 18, regarding pressing charges or seeking restitution for the damages, but he can do so without fearing violating the CA law regarding sex with someone under 18.
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