No, it's not appropriate. Such topics are vulgar and disrespectful to a relationship. A healthy relationship should be based on mutual respect, love, and positive values, not on such inappropriate and objectifying obsessions.
There's no way to tell if the 'big dick wife story' is popular just from this name. It could be a very niche story that only a few people know about, like a family - passed - down anecdote or something created within a small community. Or it could potentially be part of a new and emerging trend in some online or offline community, but again, more information would be needed to say for sure.
I'm not sure specifically which 'big dick wife story' you're referring to as there could be many fictional or personal anecdotes with such a name. It could potentially be a made - up story within a certain group or community, but without more context, it's hard to say exactly.
One possible 'big dick for wife story' could be about a husband who surprises his wife with a grand romantic gesture that shows his big heart rather than a literal interpretation. For example, he plans an elaborate vacation to a place she has always dreamed of going. It's a story of how his love in a big way (like the concept of 'big dick' in a non - vulgar sense) makes her feel special and loved.
Sharing such a story is highly inappropriate as it involves vulgar and private sexual content that should be kept within the boundaries of a couple's relationship and not made public.
Sharing such a story is highly unethical. It involves violating someone's privacy and can cause great harm to the people involved. It is not acceptable behavior in a civilized society.