Motel Girl by Valerie Gray; A. E. Oliver

In this quartet of sordid and lusty stories, men and women and women and women come together in cheap motel rooms for tawdry sex and cheap thrills. They are the people you see all around you--teachers, cheerleaders, office drones--who put on a clean pubic face, but when behind closed doors in a $39/night room, they enter the twilight of forbidden pleasures and filthy desires.