The Perfect Taste of Sex(2018)

Original title: 완벽한 섹스의 맛

Yong-pal has an unsatisfactory night with his girlfriend Amy and he goes to a sex therapist called Ban-hee to recover things in his relationship. Through the intimate 'therapy' he gets with Ban-hee, Yong-pal is confident that he's better and goes to see Amy. They have a hot time and they are content with each other but Yong-pal heads to see Ban-hee once again...