A combination of targeted chemical injections selectively stimulated kisspeptin-responsive neurons; once they’d been so activated, the mice became more driven to pursue the female mice, and for significantly longer intervals, and were less anxious while they did so.
This study marks the first time the hormone has ever been linked to a command of sexual and social behavior.
Because earnings rise with age, and women tend to couple with older men, relative earnings around the time of childbirth could put subtle pressure on women to drop out of work.
That said, a study that compared Danish twin sisters found that the earnings of women who married older men were no different, on average, than those who married men closer to them in age.
In the case of women with younger husbands, Drefahl suggested, the gender difference could be due to women being less reliant on their partner for support, and so benefiting less from the energies of a younger spouse.