Swinging Wives (1971)
A pseudo-documentary about bored, cheating housewives.
massage
CRS-022 My Wife Was Played With The Men Of The Neighborhood – Momoka Nishina (2012)
A wife is videotaped getting fingered in a massage session and is blackmailed for sex. Her husband is forced to watch but starts getting aroused.
Round Numbers (1992)
A wife suspects that a hot model is having an affair with her husband. She enrolls in a health spa to spy on her and finds herself getting sexually involved with one of the trainers.