In movies, it's a rather rare occurrence as it involves extremely disturbing and non - mainstream themes. In literature, it's also not common as most works tend to focus on more positive or at least less extreme human relationships. Such a theme goes against many moral and ethical standards that most creators uphold.
Some might do it for shock value. They want to get attention by spreading something extremely salacious. Another reason could be a form of revenge, if there are some personal grudges involved.
Definitely not. These kinds of stories usually objectify women and promote disrespectful and inappropriate behavior towards spouses. It goes against the values of a healthy and respectful relationship.
Definitely not. This goes against basic moral and relationship values. A healthy relationship is based on mutual respect, love, and fidelity. The idea of one partner watching the other in such a degrading situation is unacceptable in a normal, ethical relationship.
These kinds of stories are often just made - up tales for shock value. Bars are places where people socialize, and while inappropriate behavior can occur, the idea of a wife being gangbanged is a very extreme and unlikely scenario. It could also be a form of slander or a malicious rumor in some cases.