One possible moral implication could be the commodification of relationships. If a wife is being 'given' to the highest bidder, it undermines the sanctity of marriage which is based on love, commitment and mutual respect in most societies. It shows a disregard for the feelings and rights of the cuckolded husband as well.
One way could be to turn it into a story about redemption. Maybe the wife was forced into this situation due to some external factors like debt. But then, through the kindness of the highest bidder, she is able to free herself and her family from the situation and in the process, they all learn the value of kindness and second chances.
It's difficult to say how common they are. In today's society, with so many distractions and opportunities for people to interact outside of their marriages, there may be more instances than in the past. But still, a large number of marriages are based on loyalty and commitment, so while it does occur, it might not be the norm. There are also cultural factors at play. In some cultures, any behavior that could lead to a husband feeling cuckolded is highly frowned upon and less likely to happen openly.
I'm not sure specifically as this seems like a rather unethical or inappropriate story concept. We should focus on positive and ethical stories in general.
One reason could be lack of emotional connection. If the husband is not providing enough emotional support, the wife might be drawn to someone else. For example, if he is always dismissive of her feelings.
Sharing such stories often involves unethical and disrespectful content. We should focus on positive and healthy relationship stories, like a couple who overcomes difficulties together through mutual understanding and support.
In a story, the wife had always been adventurous and the husband was more of a homebody. The wife joined a club where she met a man who shared her interests. Slowly, she started to form a deeper connection with this man. She would lie to her husband about where she was going. When the husband finally found out about this relationship she had formed that was bordering on cuckolding, he was heartbroken. They then had to decide if they could salvage their marriage.
This is an unethical and complex situation. But here's a fictional non - explicit story. There was a wife named Lily. She was in a marriage that had lost its spark. She met a man at her workplace who was very charming. She was reluctant at first but gradually got closer to him. Her husband, Mark, noticed the distance growing between them. Eventually, Lily realized her mistake and worked hard to fix her marriage.