Joan I'm sure the woman you speak about "caused no bother*. My own concerns are not that a prostitute's activities may adversely affect me or wider society but whether it adversely affects the woman herself.
Roger Matthews wrote a book entitled "Prostitution Politics and Policy". Having researched the subject of prostitution for some twenty years, he is against the liberal view that it is just a form of work, essentially no different from any other paid employment.
An estimated two-thirds of prostitutes have experienced violence from their clients, sometimes because they refuse certain practices, such as anal sex, or because their client is unwilling to pay. Street prostitution is the most dangerous occupation a person can be involved in, carrying 18 x greater risk of being murdered.
Matthews found that most of the women he met were "extremely desperate, damaged and disorganised". He had interviewed women who had carried on selling sex immediately after being stabbed, raped, beaten and in one case hours after giving birth. He found that women in the sex industry often had a history of physical and sexual abuse, parental neglect, local authority care and addiction issues.
Matthews came to the view that women should not be criminalised for selling sex but given every assistance to leave the sex industry, and men should be deterred, by law if necessary, from buying sexual services. Women who have convictions for soliciting are apparently categorised as sex offenders and this adds to the difficulty of finding a job outside the sex industry.
grandmatie When you say "think how much tax can be collected" (if prostitution were to be treated like any other form of self-employment), has it occurred to you that this may have unforeseen consequences? In The Telegraph in 2005 there was a report that a 25 year old waitress who turned down a job providing "sexual services" at a brothel in Berlin faced possible cuts to her unemployment benefit under laws introduced that year. I don't know the outcome of that case but it certainly demonstrates the risks of legitimising work in the sex industry.
I really don't see why the mostly highly vulnerable women and men should be further damaged simply because it is deemed by some that "men need sex" and that it is acceptable for such need to be fulfilled at the expense of another person's wellbeing.
While the mythology of the "happy hooker" is perpetuated in films like Pretty Woman and the book/series Belle de Jour/Diary of a Call Girl, the reality for most people is very different. Those women who call themselves "prostitution survivors" - who have had direct experience of the sex trade - believe prostitution is intrinsically demeaning and harmful and that a civilised and humane society would not facilitate it.