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.
Some people might create such stories out of a lack of understanding of healthy relationships and proper values. They may have grown up in an environment where they were exposed to negative or immoral ideas. However, this is no excuse for creating such inappropriate and offensive content. Society should promote positive values in relationships like love, trust and respect instead.
It could also be that in some extremely misogynistic or immoral sub - cultures, there are individuals who think this is a form of 'entertainment'. But this is completely unacceptable in a civilized and moral society. In general, these reasons are not justifiable as they violate basic human rights and respect for others.
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.
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.
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.
One reason could be comfort. Bras can sometimes be uncomfortable, especially if they are ill - fitting. So, for the sake of comfort during a long day out, a wife might choose to go braless.
One reason could be guilt. If she has a conscience, the weight of her actions might become too much for her to bear, so she confesses. Another possibility is that she wants to come clean in order to save the relationship. She might think that by being honest, there's a chance to work through the issues and start anew. Or it could be that she's been caught in some way and has no other option but to confess.
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.
In some stories, drug addiction can play a role. If she or someone in her family is addicted to drugs, the need for money to buy drugs can push her into prostitution. Also, a lack of education or job skills can limit her options, making prostitution seem like the only available way to make a living.
In some fictional stories, a character might consider it because they are in a situation where they are feeling unloved or unappreciated in their own relationships. But this is no excuse. They might also be influenced by a sense of envy towards their best friend's relationship, thinking that having his wife would somehow make them feel better. However, all these reasons are just wrong and unethical justifications in the real world.
Shyness or lack of confidence can play a role. If you're worried about how others will judge you, it can make you nervous and affect your storytelling. Another reason could be a poor memory. If you can't remember the details of an event well, it's hard to tell a vivid story.