Sublime

being an involved dad creates a “dad brain” that replaces his single-man desires. He’ll experience a decrease in the testosterone previously used in the hunt for sex and recovery after rejection, and an increase in oxytocin emanating from the joys of loving and being loved by an infant who needs him.

“Dunbar’s number” is a theoretical cognitive limit on the number of stable social relationships humans can maintain at one time. According to Robin Dunbar, a British anthropologist, humans have the cognitive capacity to keep track of somewhere around 150 close personal connections. Beyond this limited circle, we start treating people less like indi

Modern men are descendants of those who erred in the jealous direction, even when this error produced some marital friction.

¿Hay que creer a David Buss, tras su encuesta del año 1993 entre estudiantes estadounidenses, en cuanto que a los hombres les gustaría tener a lo largo de su vida por término medio 18 compañeras sexuales y a las mujeres, sin embargo, sólo cuatro o cinco?

If we compare gibbons, which are monogamous, with baboons, which are not, we see that baboons have marked sexual size dimorphism and enlarged canines. Polygyny—which is associated with strategies two and three from the previous chapter—leads inexorably both to male-male violence and to the morphology that enables that violence.