Yes, there are. The concept of cuckoldry often involves themes that can be considered disrespectful and unethical in relationships. It can promote feelings of humiliation and violate the privacy and dignity of those involved.
Definitely not. There are stories where it might seem like a negative concept at first, but as the story unfolds, it turns out to be a journey of self - reflection for both parties. For example, the wife might have made a mistake that led to the 'cuckold' - like situation, but through the process, she realizes her true feelings for her husband and they end up mending their relationship. It can also be a way for them to explore new aspects of their relationship in a more open and honest way.
No, they are not very common in mainstream literature. Literature usually focuses on more positive or moral relationship models. But in some niche or experimental literature, such stories might appear to explore complex human emotions and relationship taboos.
There was a story where a wife was interested in a particular social circle that her husband wasn't really a part of. She started attending events alone at first and then met someone she clicked with. She told her husband that she wanted to explore a friendship further, which could potentially turn into something more. The husband, though initially hesitant, respected her decision as he trusted her. This shows how in some 'wife first cuckold stories', communication and trust play a huge role.
I don't have any real - life stories of this sort. But if it were to happen, the husband would likely need to be very secure in himself. It could be a situation where the wife's new relationship with another person (in a bi - context) might make the husband feel left out at first. However, if they communicate well, they can find ways to make it a positive experience for all.