I know a prostitute who has a regular job and only works occasionally, am i raping/exploiting her?

You're not raping or exploiting her, its a 2 way exchange between adults. This isn't the kind of prostitution I have a problem with. I wouldn't want to think my husband had done this though, just personal choice really. Nothing is stopping you getting a gf or wife later but I advise you not to tell them you did this in case they feel as I do regarding my husband.