apparently "they" are the people needed to protect her children from herself.
Not that I think it has been terribly scarring for the 16yo son to see a naked woman, I'm sure he plans on seeing more of em... but if you plan on doing something borderline illegal, or really illegal, and try to have pictures of it developed at a local public store, you should realise that it is those people's duty even to call the authorities.
And I agree, to have the mother do this for her son, and invite some friends over to boot, that really starts to have a Jerry!-Jerry!-Jerry!-feel to it.
d'oh, Tophat beat me to it