Politely but firmly ask her to stop. For example, you could say 'This is not the right time or place for such stories.'
Try to change the topic immediately. You can start talking about the delicious food at the party or the beautiful Christmas decorations. This way, you can smoothly divert the attention away from the inappropriate topic.
Politely change the subject. Maybe start talking about the beautiful scenery during the vacation instead of the sexual aspect. Say something like 'You know, that beach we went to was so beautiful, let's talk about that.' This way, you can avoid the discomfort of the inappropriate topic without making her feel bad.
One should firmly and clearly express that such talk is unacceptable. Set boundaries and communicate the importance of loyalty in the relationship.
Just listen attentively. Nod and show that you're interested in what she's saying.
Tell them firmly that they should not be sharing such personal and inappropriate information. If possible, remove the person from the situation where they might continue to spread such stories. Also, it might be a good idea to inform the wife about what has been happening so she can take appropriate action if she wishes.
A good friend should firmly but politely stop the conversation. For example, say 'This topic makes me uncomfortable. Let's talk about something else.'
Tell her that it makes you uncomfortable and that it might also make others uncomfortable. Suggest finding other topics to talk about that are more appropriate for public or general conversation. You might say, 'I love you, but sharing sex stories is not something I'm okay with. Let's talk about our travels or hobbies instead.'
You should firmly stop them. Let them know that it's inappropriate and disrespectful to share such private information.
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.
Well, it's important to handle it delicately. Firstly, don't use it as ammunition to start an argument. Instead, see it as an opportunity to understand her deeper feelings or desires perhaps. But also, since she was drunk, it might be wise to take it with a grain of salt and approach the topic again when she's fully in control of her faculties to get a more accurate understanding.
One should stay calm at first. Try to understand why she is sharing this story. Is it just a funny anecdote or is there something deeper? Then, have an open and honest conversation about how you feel. For example, you could say 'I'm not sure I'm comfortable with you sharing this kind of story.'