Susan Pinker's book is called The Sexual Paradox as a play on the economists' idea of a "gender paradox": compared to men, women earn less and have lower status, but are happier with their work. But this is only a paradox if you assess the value of your job on its own, not in relation to the rest of your life. Career-oriented women and men are likely to rate their jobs that way. As I noted yesterday, Catherine Hakim estimates that about 20% of women are primarily career-oriented. By contrast, about 55% of men are primarily career-oriented.
Thus the paradox: career-oriented male economists - that is, most economists - are puzzled that women don't count happiness the same career-oriented way that most men do. And some women are like most men. But most women are not like most men. There is only a paradox if you assume that men and women are the same.