Well, it could be considered common in a sense. It often adds an element of shock and drama. Writers may use this plot to show how society views and treats those with such a past. Also, it can be used to explore the character's journey of acceptance or rejection of their partner's past, like in some real - life inspired stories where people face this difficult situation in their marriages.
There may be some works that touch on such themes in a more complex and often cautionary way. For example, in some novels that explore the seedy underbelly of society, a character might have a past related to prostitution. But these are not to be glorified.
There may be some in certain works that aim to explore complex human nature and social issues. But such stories are often controversial. For example, in some classic novels, the author might use such characters to show the contrast between different social classes and moral concepts. However, most of today's literature focuses more on positive and healthy relationships.
The term 'training the wife like a hooker' is inappropriate and objectifies women. We should promote healthy, equal and respectful relationships, not such demeaning concepts, so there are no positive stories in this regard.
She could come clean immediately and explain to her husband and others that it was just a prank or a misunderstanding. Honesty is often the best policy in such cases.
In a story, if a wife poses as a hooker, things can go terribly wrong in many ways. For instance, she could end up being harassed by strangers who assume she's available for certain services. Her family and friends might also find out and misinterpret her actions, thinking she has some sort of hidden agenda or is having problems in her marriage. This could lead to a lot of social isolation for her. Moreover, if the police get involved due to misunderstandings, it would be a very complicated and difficult situation to handle.
By humanizing the character. Instead of just defining her by her past as a hooker, show her dreams, her hopes, and her daily struggles. Maybe she had no other choice at that time but now is trying to build a normal life. The story could also explore how the couple overcomes the challenges together, without putting blame on her for her past.
There are no positive interpretations. The phrase combines two very negative and inappropriate ideas. A wife is a person with her own rights, dignity and identity. Any form of 'training' in this context is unacceptable. We should strive for relationships that are based on positive values like kindness, compassion and equality.