I'd put money on it being a vexed ex boyfriend or something putting it up for kicks / retaliation.
That could well be that case.
It could be a civvy girl who's chucked her boyfriend and he's too immature to handle it.
Girls, whether civvy or WG, should be extremely careful what kind of photos they let their boyfriends take as the Internet abounds with "ex-girlfriend" sites where guys take revenge on girls by publishing nude photos of them.
I saw a post, on another forum, of a girl who said she was petrified that her ex-boyfriend would post her nude photos to her parents.
The girl, in this case, could well be innocent.