Polygyny is legally accepted in many Muslim majority countries and some countries with a sizeable Muslim minority; it is also accepted in some secular countries in varying degrees.
Polygyny is more widespread in Africa than in any other continent, especially in West Africa, and some scholars see the slave trade's impact on the male-to-female sex ratio as a key factor in the emergence and fortification of polygynous practices in regions of Africa.
In such cases, the deceased man's heir may inherit his assets and wife; or, more usually, his brothers may marry the widow.
This provides support for the widow and her children (usually also members of the brothers' kin group) and maintains the tie between the husband and wives' kin groups.
This favours polygamous marriages in which men sought to monopolize the production of women "who are valued both as workers and as child bearers".
In sociobiology and zoology, researchers use polygamy in a broad sense to mean any form of multiple mating.
Worldwide, different societies variously encourage, accept or outlaw polygamy.
Even their jealousy – and some act extremely jealous – does not stem from love but from a sense of ownership: she is mine, so no one else can have her. Much of what they say to their wives makes them sound angry or even not right in the head.
But you cannot take everything they say at face value: they lie and make up stuff just to throw her off balance. They beat their wives because they can get away with it, because it is how they have learned to control their wives to get what they want.