The husband should first take a moment to collect his thoughts. Then, he should have an open and honest conversation with his wife. He could say something like 'I'm shocked that you would even think of such a thing. Our relationship is based on loyalty and respect, and this goes completely against that.' He may also suggest seeking professional help, like couples counseling, to address the underlying issues that might have led to such a request.
No, it is completely unethical. In a committed relationship, such behavior violates the trust, respect, and boundaries that should exist between partners. A marriage or relationship is based on mutual fidelity and loyalty, and any form of inappropriate behavior towards strangers goes against these fundamental values.
No, it is not appropriate at all. Such content involves vulgar and inappropriate sexual implications which are not suitable for public discussion or sharing.
Definitely not. A proper phrase should be more easily understandable and follow standard language usage. This phrase 'his first stranger cock story' is so odd that it's not something you would encounter in normal communication. It might be some sort of very specific jargon within a very small group or just a made - up, unclear statement.
First, clarify what exactly he means by 'did story'. If it's a strange or inappropriate request, you can tell him that you don't engage in such things. You could also distance yourself from this friend if he persists with such odd requests. Maybe he's just using the wrong words and there's a misunderstanding, but it's better to be cautious.