What? Of course they should. They're deliberately breaking laws with their fake IDs.
Sure, the child will get in trouble for breaking the law with a fake ID. That doesn't excuse the adult from being deceived with said fake ID, he will still go to jail and become a love offender for the next 30 years or more.
Also may I add that it is illegal for anyone under the age of 18 to produce naked photos of themselves of their own free will. Children under the age of 18 have been arrested for that stuff and have become registered love offenders even though it is their own body.
The law is broken in general.