The Real Secret Married Life (1994)

Directed by Yutaka Ikejima

A man who was once divorced due to a lack of sex remarried, but now has a much older wife. To avoid another sexless marriage after his previous mistake, the couple try out various cosplays and creative situations, enjoying their married life to avoid any sense of staleness. However, the couple's sexual exploration begins to get out of control, and before long it develops into a big commotion that involves everyone around them...