No, sharing such sexual stories is highly inappropriate in most public and social settings. It violates the norms of decency and can make others uncomfortable.
Well, it's kind of hard to give an exact measure. But the anime has made good progress and has adapted quite a few story arcs from the manga. There are still many exciting parts in the manga that haven't been animated.
Well, it's a bit tricky to say exactly. The anime has made decent progress, but it's not caught up completely. Some key storylines and developments from the manga are yet to be shown in the anime.
Since I don't know the exact context of this 'never balls deep wife story', it's difficult to say. It might be a story within a particular group, family, or community with its own unique events and characters that only those close to it are aware of.
The JJK anime ends at a specific point in the manga that varies depending on the pacing and adaptation decisions. You'll have to look closely to determine exactly where.