[Nyororin]

Or it could be related to less stress, as a woman who is educated is more likely to know how the world works and have work experience - so be more understanding of her partner`s problems and concerns.
I have known a few couples where the wife lacks any higher education, and there tends to be a lot less understanding between the wife and husband due to 1) a general lack of knowledge 2) more demands without comprehension of what they entail and 3) less willingness to talk because there is little overlap of interests and knowledge.

I don`t really know how this would change when the husband ALSO has little to no education though... It seems it would even out.