What is a woman called when she has a relationship with a married man?

I'll tell you whats happening to the single girl having the affair with the married man. Not much of nothing,don't expect him to leave the wife because he won't,he's just using you for sex or should I say a garbage can. He may say he is leaving the wife that nags and doesn't understand or love him but he won't and you know why,because he loves that wife that nags and doesn't understand or love him. They have memories together and when you have a couple that has a history and memories its hard to separate them. It doesn't mean the poodie is not good at home,it just means that you are avalible for sex and he'll continue to use you for that until you put a stop to it and have more value about yourself. Send him back home.