This is a very difficult and embarrassing situation. First, you need to have a private conversation with your wife to understand her motives. Maybe she was drunk or made a big mistake without realizing it. Then, you should have a sincere talk with your friends as well, asking them to respect your family's privacy and not spread this matter around.
She might have been under the influence of alcohol or drugs, which impaired her judgment. Another possibility is that she has some psychological issues that she has been hiding, like a need for attention or a form of self - harm behavior in a very extreme way.
This is a very difficult and uncomfortable situation. First, you should immediately remove your friend from the scene to avoid further embarrassment. Then, have an honest and calm conversation with your wife to understand why she did such a thing. It could be a misunderstanding, or there might be some underlying issues in your relationship that need to be addressed.
If it was some sort of a dare or a joke that went too far, you might have to set some boundaries with your friends as well. Let them know that this kind of behavior is not acceptable in your relationship. And for your girlfriend, if she doesn't seem to understand how wrong it was, you may need to seriously consider the future of your relationship. It's important to be with someone who respects your feelings and the norms of a relationship.
No, it's not appropriate at all. In most social and cultural norms, being topless in front of others, especially friends, is considered improper and violates the basic sense of privacy and propriety in a relationship.
It could mean a few things. It might be a sign of her being overly comfortable in the wrong way. Or she could be trying to make a statement, like she feels restricted in the relationship and this was her way of breaking free, but it was a very inappropriate way.
No, it's not appropriate at all. In most cultures, nudity in front of others outside of an extremely private and consensual context is unacceptable. It violates social norms of modesty and privacy. Your wife should respect the boundaries of appropriate behavior in a social setting, and your friends may also feel very uncomfortable with such a situation.
One possible reason could be that she has a very different view on nudity and privacy, perhaps influenced by some extreme liberal ideas. But this is still not acceptable in a normal social context.
There could be some psychological factors at play. If your wife is overly comfortable in her own space and not fully aware of social boundaries, it could lead to such a situation. Or perhaps she was under some sort of stress or distraction that made her forget about the presence of your friends. It's also possible that there was a lack of proper communication between you two about having guests over and what is appropriate behavior during such times.
First, it's important to communicate with your wife privately as soon as possible. Ask her why this happened. Maybe it was an accident or a misunderstanding. For example, if she thought the friends had already left. Then, you need to have a conversation with your friends too. Let them know this is inappropriate and you expect respect for your family boundaries.