I dated a Chi-O back in the early 80's. Her roommate was doing this. Married CEO guy came in every other Weds evening for a business meeting at the plant and left Friday morning. She would spend the night with him nearly every one of those Thursdays.
I worked at my uncles gas station in the late 70's while in HS when they still had repair garages. The mechanic on duty was a very good looking guy.On occasion women would have sex of various degrees with him in the back room for money taken off their repair bill. He had an actual pull down cot set up or he would go to their apartment.
Women have been selling themselves for eons.