through an online bulletin board, people with similar sexual preferences gather for the ultimate fetish: partner swapping! a hidden retreat in the kanto region, couples engage in swapping activities. we were able to capture the entire event with a fixed camera. the reasons for partner swapping vary from person to person. both men and women seek ultimate pleasure. through the internet, 8 couples, 16 people in total, gathered for a luxurious 4-way swap sex recording.