//Now both you and I know these girls are exploited by there employers for little as £20 or so.. //
You really need to be a little bit more specific. The 'girls' on the call stations do not take clothes off and sell themselves.
Stripping in most establishments is safer than crossing the street.
Prostitution is more like the person taking advantage of their 'customer' This is not always safe for the person that is not attractive enough to join a reputable organisation, unfair, I know, but life is not fair. There is always a choice.