In a few societies, for example, children even have more than one “father.” In Amazonian South America, there are communities that accept affairs outside marriage and hold a belief that when a woman has sex with more than one man in the run-up to her pregnancy, all their sperm help build the fetus. This is known by academics as “partible paternity.”
The language of accepting affairs is a very awkward way to describe this norm. An affair implies lack of consent of all parties
