From my own understanding (had to research this stuff about a year ago - long story) the law is basically this -
Advertising prostitution is illegal
Selling sexual intercourse on the street is illegal
Managing a prostitute is illegal
So if you're a single woman who has sexual intercourse for money, in your own home, without advertising, that is legal.
Also, if you could prove sexual intercourse is only (sorry to be blunt) penis to vagina, you could probably offer other sexual services legally.
Edit: By "single woman" I mean there is only one of you.