I meant throughout history, not just in the last 20 years of corrupt societies. Polygamy is a marriage option and not a sexual preference.
Luckily history does not follow your limited view of the world. Unless the
Mahabharata (an ancient Hindu epic) was written a decade or two ago. Or Tibet didn't exist.
By the way polyandry is not a sexual preference, and is not a common marriage option only because most local law codes don't recognise it, just as polygyny is not legally recognised in many places