Leftist Logic Leads to Forced Prostitution
Of course, following this logic, "in a welfare state where people receive state benefits when they are unemployed," this means "if we really believed that prostitution were the same as hospital cleaning or serving in a shop, those who were unemployed could justifiably be forced into prostitution if an opening for a prostitute became available," as Theodore Dalrymple reminded us some months ago — None Dare Call it Prostitution
All of this aside, prostitution's wrongness does not mean that it should be criminalized. Following the proto-libertarian St. Thomas Aquinas, not everything that is immoral should be illegal. Better to follow no harm, no foul and de minimis non curat lex.