Technically, prostitution is legal in Britain, however soliciting (approaching potential customers on the street) is illegal.
I think - to use a feminist phrase - "its her body, it's her right"... men accept the right of a woman to say "no" ... women must accept the right of a woman to say "yes, that'll be £ xxx please"
I would imagine that in a controlled and legal environment certain health and safety steps would be followed... clean women/men, condoms etc.
I should also think that those opposed to it are mainly pimps running the rackets, the human traffickers, and women who use sex as a weapon in their marriage.
After all, no one, under a legal system can be forced into the business.
No one gets funny with people providing certain services on your body... cutting hair, dental work, surgery, yet providing this service that can help the mental well being of a man or woman is frowned on.
Personally, I don't approve of two timing, and I never would, but I also notice that many men or women today that are simply going out with someone, or living together expect the same rights and privileges as that of a married couple. If you take the wedding vows, you promise to not sleep with anyone else, yet people who have not made any such promise or demanded from their partner are expected to do the same.
Don't get me wrong, I don't advocate sleeping around or cheating on your partner, but how would you ladies feel if a man said he felt betrayed because it was an unspoken rule that you don't go to the hairdressers and let someone else touch your hair?
My arguements above, in themselves, don't appear overly valid, but the idea is to get you to think about what you really have against or for prostitution?