Instead of making love, it should be a mutual activity between two people, but in this movie, the wife is the only one "active", while the husband just lies still enjoying himself and then ejaculates. This is why the woman is bored with having sex with her husband, she wants to find another man, and the man she needs is not far away, he is already "available" in the house. Thanks to their daring actions when they discovered this, the two nephews each had the opportunity to have sex with the beautiful woman, and the climax was that on that night, both went to the sister-in-law's room and massaged her. And the old husband still had no idea that someone else was present in the house...