Mostly, these are fictional concepts. In modern society, such practices go against moral and ethical norms. There are very few, if any, real - life cases that would be acceptable in a civilized and legal framework.
These types of stories are often fictional fabrications. Our society is built on the principles of monogamy and respect for individual rights. While there may be some extreme and unethical situations in the fringes of society, they are not the norm and are not legal in most places. The idea of being 'tricked into being a shared wife' is more of a plot device in some fictional or salacious tales rather than a common real - life occurrence.