No. Such stories are not acceptable in literature as they are vulgar and violate the norms of good taste and decency. Literature should aim to promote positive values, emotions and ideas.
Sure. It can be seen as a way to understand the unique qualities each partner brings. The 'contrast' could highlight the diversity in a relationship. For example, the wife might be more empathetic while the male has more practical skills, and these stories could be about how they work together despite these differences. This positive view can help people in relationships appreciate each other more.
There are no positive aspects. This kind of comparison is inappropriate in the context of human relationships. We should promote respect, love and equality in relationships, not such vulgar comparisons.