My question involves criminal law for the state of: California
A person had sexual intercourse with a girl when he was 18, and the girl was 16-17. Male was a virgin, girl was not. This was a friendship and relationship that possibly began when the male was underage, but sexual occurrences were after the 18th birthday. Girl's parents found out about what has occurred, what can they do?
-No used condoms present for DNA testing
-No pregnancy
-Only photographs ever exchanged were lingerie, never nude photos
-Assuming that parents have some possibly suggestive or explicit texts between M and F about what has occurred, or between F and others discussing what occured
-Only "witnesses" that could vouch did not see the actual act occurring, can only testify about seeing the M and F before it occurred
-M was virgin, F was sexually active and secretive about it from parents
-Relationship was secret from parents
The law seems to show that it is a misdemeanor, any other possible crimes that could be brought up? What could the parents do, and what are the chances that the parents could actually do something? What would the Prosecutor need in order to get a conviction, and is this enough evidence to get a criminal charge/investigation?
Please help, M is terrified and scared for his future.

