She's getting paid by someone though. And who knows, there may be sex. And even if there isn't, it's still 'prostitution' in the sense of selling yourself and your body.
Yeah, brothels and pimping are illegal for obvious reasons. There's also a very specific law that you can't advertise prostitution services in phone boxes, but there are no other forms of advertising specified. You can, therefore, advertise online or in a paper or whatever. You have to be independent and do it in private.
Uh, I just realised the implications of that post. I merely meant she would be so smitten by my charms and good looks that she would want to have sex. Nothing 'dodgy'.
I didn't even know that was possible, but it is. Just when PL thought he had 'creepiest post of the day' all wrapped up, too.