Abso bloody lutely
I can't see that any crime is committed. Teenagers have a perfectly healthy propensity to display their bits to each other, and this is just the tech version.
OK, if someone gets hold of the picture and uses it for blackmail etc, that's a problem, but the problem is the blackmail not the picture.
The idea that the state should even care if a teenager's friends have seen his dick, or her minge, is entirely inappropriate. What next? shagging licences? a groping tax? health warning tattoos?