This allowed the woman to decide if she wanted to get into the union knowing that there would be sister wives in future. When the time came for him to take the second or third wife, he then would still ask his first wife for permission before he gets involved in a relationship with a woman. In some instances the first wife would pick the other woman.
What I am seeing in this show though is completely different, the men approached their wives after they had dated the mistresses for years.
Two of the wives conceded, but it was a painful experience for them.
These are just vulnerable women, who were raised and taught to submit to their husbands, and these men are taking advantage of that.
They do not want their husbands to take other wives, their body language said it all - the looks they gave the other women and pain was written all over their faces.
We seem to take two steps forward in our progress in the fight against patriarchy and then 10 steps backwards as we normalise abusive behaviours in shows such as Mnakwethu.