Sadly, prostitutions has been a dangerous profession over the years, and has attracted the attention of several serial killers( e.g. Jack the Ripper, the Yorkshire Ripper and that bloke in Ipswich whose name escapes me). Even working in a knocking shop doesn't guarantee security; two women were murdered in a Shrewsbury parlour about five years ago. One was a sex worker, the other was the elderly receptionist. There'e no real answer, short of employing a bodyguard (yeah, right). Any women with cash around, and who is conveniently naked (and therefore vulnerable) is going to be an easy target for a homicidal lunatic. Several madmen have justified their actions by saying that prostitutes are "the spawn of satan" or suchlike, as if that entitled them to execute them. Perhaps a more mature approach to sex work by society, might be a good idea. At the moment, the mindset of the police seems to be the same as that which caused so much undetected paedophile grooming: "these girls have made lifestyle choices".