The Violation of Claudia (1977)

Claudia is a bored housewife whose husband, Jason is too busy to give her the attention she needs. Taking matters into her own hands, she proceeds to bed her tennis instructor, Kip, who puts her to work as a callgirl. She has many escapades. When she finally returns home, she catches Jason in bed with Kip, who conspired with her gay mate to set up the entire arrangement.