In some stories, it could be a result of being misled. Maybe she was given false information about the place and thought it was something else entirely, like a regular club or a place for a different kind of entertainment. Or, she could be under the influence of some sort of magic or spell in a fantasy - themed story that compels her to go there.
One possible motive could be financial desperation. If the family is in a very difficult economic situation, she might see it as a way to earn a large amount of money quickly. Another could be a sense of power or independence. In a fictional world where women have few options, running a brothel could give her a level of control and influence in a male - dominated society.
Well, in some fictional tales, it could be a result of a complex psychological dynamic. The husband might have some sort of fetish or abnormal desire that the wife is trying to fulfill out of love (in the context of the fictional story, of course). Or perhaps the story is set in a post - apocalyptic or lawless world where the normal rules of society don't apply. In such a world, they might see this as a way to gain an advantage, like getting resources or protection. But again, these are all fictional and not the kind of behavior we should promote or expect in real - life relationships.
One possible motive could be a sense of inadequacy. The wife might feel that she can't fulfill some specific desires of her husband sexually, so she arranges for a hooker. Another could be a strange form of self - sacrifice, where she puts her husband's needs above her own feelings of jealousy or propriety.
Financial motives can also be there. If the wife discovers that the husband has some hidden money or is involved in some financial wrongdoings, she might blackmail him to get a share of the money or to make him correct his financial behavior. For instance, she could threaten to expose his tax evasion to the authorities if he doesn't give her a certain amount of money for household needs.
In fictional stories, it could be for shock value. Writers sometimes create extreme situations to grab the reader's attention.
One possible motive could be boredom. If she's constantly at the pool and has a lot of idle time, she might be more vulnerable to the advances of others. Another could be seeking excitement. The pool environment can be quite lively and different from the daily routine, and she might get caught up in the newness of it all.
In such stories, one possible motive could be revenge. Maybe the wife feels wronged by her husband in some way and wants to publicly embarrass him. Another could be a lack of self - control. She might be easily influenced by someone else and give in to temptation without thinking about the consequences.
One possible motive could be extreme revenge. If the husband has been unfaithful in a very hurtful way or has committed some heinous act against the wife, she might be driven to such an extreme act out of sheer rage and a desire to cause him the ultimate harm.
One possible motive could be jealousy. Maybe someone is envious of the love and family life the lesbian moms have built, so they try to blackmail them to disrupt it.