Comment by homedepotdave

Honestly, I'm quite surprised by how much people here seem to think it's biological. It seems to me there is no way society's slight move toward encouraging gender-neutral playing isn't still strongly offset by the pervasive culture of machismo and femininity. The second your boy steps foot into school, if he's wearing something pink or playing with a doll, other boys will make fun of him. A single incident like that is a plenty strong incentive to stick with same-gendered toys.