Not true. Woman nowadays work all the way to the end of their pregnancy. I have a Spanish friend that worked and went to school all through out her pregnancy, and the father of the child was married to another woman. For some reason she realized that she needed to leave him after found out she was preggers. Back to my point, she worked full time and went to school, untill she had her baby, she than took a week or two off (which is something a considerate male will do anyway to help the wife out) and than was back off to work. If she had another responsible male in her life, things would have been easier for her.
Nowadays woman are working till the end of their pregnancies anyway… when that occurs often males take time off to take care of them… so you stating that a woman cannot be productive all the time is not true. Now if we have the opportunity to stay home while the hubs works and take advantage of it… thats a different story.
Half of the women I work with are pregnant and work untill they give birth, and majority of them are back at work a week or two later. If they had multiple husbands, they would get help with the baby and household chores so that they can concentrate on putting food on the table… i mean they are doing it anyway without any help…