SDAM-016 Wife Swapping! Thin Wall! The obscene sounds coming from next door make you suspicious! Fire lit W affair

Film Introduction

Two couples were invited to participate in a project titled 'The Secret to a Happy Marriage.' As they discussed, lewd kissing sounds started coming from the adjacent room (the staff played these sounds on a cassette player to evoke H feelings and suspicions). Both couples became increasingly suspicious and aroused by the sounds, eventually engaging in swinging through the wall that separated them.