I think it's positively foolhardy for romantic love to be unconditional. It provides people with a charter to treat partners badly with no consequence.
If we're talking in the generic sense about this issue and not just about the merits of Andrew Marshall's ruminations, I agree wholeheartedly that men and women need to invest in their romantic relationships. But I still think that the emphasis sems to be mainly on what women should do to invest in their personal relationships. This supports a more generalised culture of women having the greater responsibility for personal relationships, whether that's with partners, children, friends or families of origin. This is sexist and needs challenging.
I quite agree that expectations of motherhood have changed and that there is far more judgement now about what makes a 'good mother' - often from fellow mothers. This culture of guilt and sentimentality has no doubt contributed to women who derive a disproportionate amount of their self-esteem from their children and their achievements.
But how about men who are disproportionately defined by work and the long hours culture? Or by their prowess at golf or gaming? Men who neglect their relationships with their partners and children, expect their wives to run social diaries and buy presents and cards for those men's relatives?
Where is the message to men that if they don't invest in their personal relationships, they run the risk of losing them?
Remember, the self-help book market is aimed at women, not men. So if those self-help books continue to peddle the message that women have the responsibility to keep personal relationships rewarding and fulfilling, but fails to address men's responsibilities, I want the readers to stop and reflect, asking:
"What about men and their responsibilities?"