Tell them firmly that you don't want to hear it. It's inappropriate and unethical.
If someone tries to share such stories, you can express your discomfort. You could say, 'I'm really not comfortable with this. We should respect the privacy of our friend's family. There are so many other things we can talk about, like how our friend is doing in general or their recent achievements.' This way, you make it clear that such inappropriate sharing is not acceptable while also guiding the conversation in a better direction.
Politely stop them and say that this is a very private matter and not suitable for sharing. For example, you could say 'I don't think this is appropriate to talk about.'
Tell them firmly that this is not an appropriate topic to share and that it makes you uncomfortable.
Politely tell them that this is not an appropriate topic for conversation.
You should firmly tell them that this is not an appropriate topic and you don't want to hear it.
Definitely not. It's not only unethical but also a breach of trust. A friend's relationship with their wife is a very private matter. Spreading stories of a sexual nature about them is inappropriate and can lead to a breakdown in relationships, not just between you and your friend but also within the couple themselves.
Tell them that it is unethical and disrespectful behavior. Encourage them to respect their partner's privacy and the boundaries of their relationship. If they continue, you may need to distance yourself from them as they are showing a lack of respect for their partner and proper social norms.
Politely stop them. Let them know that this is an inappropriate topic that makes you uncomfortable.
Politely tell them that this is not an appropriate topic for discussion.
Politely tell them that it's not an appropriate topic and you don't want to hear it.