This is clearly unethical. A relationship between a husband and a wife should be built on mutual understanding, trust and respect. Using such offensive language to describe a spouse is unacceptable. It can cause great harm to the relationship and the person being described, and it also sets a bad example for others in terms of relationship values.
There could be various interpretations. Maybe in the story, the wife forced the husband into some unethical or immoral behavior through her influence, which made him feel like he had lost his integrity, thus using the extreme term 'whore' to describe his state of mind. However, without knowing the details, it's hard to say for certain.
I don't have an exact story similar to that title on hand. But there are many stories where a partner's actions can make the other feel pressured into doing things they don't want to. For example, in some stories, a spouse might push the other into a cut - throat business deal that goes against their ethics, making them feel like they've sold their soul.
I don't know the reason for such stories. It might be part of some dark and unethical fictional genre or just a random, offensive idea someone came up with. Such themes are best avoided as they have no positive value.
Rather than focusing on such offensive concepts, we could look at stories about loving, supportive and equal partnerships between spouses. For example, stories where couples support each other's dreams and grow together.