Women seem to be both under-utilized and under-incentivized in the labour force, even though those in high-income countries typically now have a higher educational level than do men.
Maybe turn that around then. Why are more men stupid/uneducated enough to enter the labour force only to be exploited by their employers for little gain in areas of life that matter? Or alternatively, why do men not have the opportunity to avoid the labour force even if they do recognize it is not to their advantage to enter it?
Obviously that is a bit nonsensical too but maybe the inherent assumption that it is good thing to spend a large percentage of your time labouring should be questioned if we want to answer questions like that.