Tell them firmly that such stories are not acceptable in the current context. For example, 'I don't want to hear this. It's inappropriate.' If they continue, you may need to remove yourself from the situation.
First, stay calm. If you're comfortable with it, you can engage in a conversation about it. If not, gently let her know that it makes you uncomfortable.
It depends on the nature of your relationship. If you have a very open and adventurous relationship, you might laugh it off or even engage in a healthy discussion about sexual fantasies in general. But if it's not something you're used to, it's important to set boundaries. You could say 'I appreciate your openness, but this is a bit too much for me right now.'
One should firmly tell the person that this kind of story is not acceptable. For example, say 'This is inappropriate. Please don't share such stories.'
The partner should first stay calm. Then, depending on the nature of their relationship, they could either politely but firmly say that they don't think this is an appropriate topic for discussion, or if they are in a more liberal relationship, they could engage in a conversation about boundaries and how sharing such personal sexual stories might affect their relationship. They might mention that while they respect her honesty, they believe there are some aspects of personal sexual behavior that are better left private. This can be a difficult conversation, but it's crucial for maintaining a healthy relationship dynamic.
First, make it clear that you find the topic inappropriate. You could say 'This kind of story is not suitable for this environment.' Then, redirect the conversation to a more positive and appropriate topic, like a recent travel experience or a new hobby. By doing this, you are setting boundaries and also keeping the conversation in a more pleasant direction.
Politely but firmly ask her to stop. For example, you could say 'This is not the right time or place for such stories.'
One should firmly and clearly express that such talk is unacceptable. Set boundaries and communicate the importance of loyalty in the relationship.
A good friend should firmly but politely stop the conversation. For example, say 'This topic makes me uncomfortable. Let's talk about something else.'
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.
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.