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Again, supposing that cavemen care about couples is wrong. Cavemen were living in tribes and new members were the concern of everyone since it could improve the survivability of the tribe as a whole. If you want to see what cavemen were like, look at the bonobos.
I have two words for you M.Biologist: single mothers. They always existed and had been subject to shame, resulting in unsucessful lives for themselves and their children. However, recent history proved that the limitation wasn't natural (or relate to biology) but actually social due to moral order. Single mothers are on the increase and while most of them are actual accidents, there are more and more women who choose to be single mother by choice, more often with high-status and wealth. This is a woman and demograph speaking. Don't mess up intrinsic and extrinsic causality altogether