One possible reason could be extreme financial difficulties. If the family is in deep debt and there are no other viable options to earn money, in a fictional and very sad scenario, a wife might consider this. But this is a very extreme and unethical solution.
One reason could be to show economic desperation. If the family is in financial trouble and she can't find other means to support them, she might be entrapped. Another is coercion from powerful and evil characters in the story.
One possible reason could be extreme financial distress. If the family is in a huge debt and she can't see any other way to earn enough money quickly, she might be pushed to the edge. For example, in some stories, the husband might have lost his job and they are on the verge of losing their house.
Perhaps some people with a very warped sense of morality might create such stories to shock others. They may be trying to break taboos for the sake of getting attention.
In the Bible, one such story is of Hosea's wife Gomer. Hosea was commanded by God to marry Gomer, who later engaged in prostitution. This story is used to illustrate God's love and Israel's unfaithfulness.
Debt. They might be in debt and see this as a quick way to pay it off. For example, if they have student loans or credit card debt. Also, some may be forced into it by a controlling person who is taking advantage of their vulnerability. In some cases, they lack proper education or job skills, so they think this is their only option to earn money.
In some fictional stories, it could be due to a lack of emotional connection in her marriage. Maybe she feels neglected by her husband and is seeking a form of intimacy elsewhere. Another reason could be a form of rebellion against the constraints of marriage.
This is a very sad and complex topic. However, instead of sharing such a negative story, we should focus on promoting positive family values and relationships. In a healthy relationship, both partners should support and respect each other to avoid such extreme situations.
Another reason could be a broken relationship with her husband. If she feels unloved, neglected, or betrayed, she might seek attention or revenge in the wrong way. Maybe her husband is constantly unfaithful, and she decides to retaliate by becoming promiscuous herself.
One reason could be for financial gain. Strangers might see that a wife has access to a wealthy husband or family resources. So, they use her by tricking her into signing over property or giving them money, like in some noir detective stories.
In fictional stories, it could be due to a need for self - discovery. Maybe the wife has been living a repressed life and decides to break free from society's norms. For example, she might have been in a controlling relationship and finally rebels against it.