If you hear someone say this, you should firmly correct them. No one should tolerate such disrespect towards a partner. You could say something like 'That's a very unkind and inappropriate thing to say about your wife.'
One should immediately call out the person for their inappropriate behavior. Then, encourage them to think about how they would feel if their wife heard such a comment. Suggest that they focus on positive aspects of their relationship and use more loving and respectful language. For instance, 'Your words are hurtful. Try to see the good in your wife and communicate with respect instead of using such offensive language.'
This statement could potentially mean that in the speaker's view, his wife has some habits in bed that he doesn't like, perhaps she hogs the bed space or moves around a lot. But again, it's a really negative and inappropriate way to talk about a loved one. We should always strive to use positive and respectful language when referring to our partners.
One should not participate in spreading it. If possible, encourage those who are spreading it to stop as it is an invasion of privacy.
React with disgust and disapproval. Don't allow the story to be spread further. If possible, try to correct the wrong perception of the person sharing the story. If it's a more serious situation, you could even seek advice from other mutual friends or an authority figure in the community on how to handle it properly, all the while keeping in mind the well - being of your friend and his relationship.
Politely distance oneself from the situation and the person sharing it. Maybe change the topic if possible. There's no need to engage further as it's an inappropriate topic.
One should firmly oppose and condemn it. Such a story promotes immoral behavior. You could tell the person that cheating is wrong and that they should respect the institution of marriage.
You should firmly stop them. Let them know that it's inappropriate and disrespectful to share such private information.
First, firmly express that this is an unacceptable topic. For example, say 'This is inappropriate and we should not talk about it.'
If you're comfortable with it, you can listen with an open mind and maybe even share your own thoughts. But if it makes you uncomfortable, calmly tell her how you feel.
If you are uncomfortable with the story, it's okay to let her know gently. Say something like 'I'm not really comfortable with this kind of story. Can we talk about something else?' This way, you are being honest about your feelings while also maintaining respect for her.
I would react with disgust and disbelief. I would try to stop the person from sharing such a story because it is not only inappropriate but also harmful. I might also suggest that if there is a real problem in the relationship described, it should be dealt with privately and through proper channels, not by spreading such sordid tales.