Sounds like a plausible theory to me, too. Hormones in young age in boys may push for a need to solve things, to explore how things work in order to make thing

Sounds like a plausible theory to me, too. Hormones in young age in boys may push for a need to solve things, to explore how things work in order to make things more efficient, mechanically or in any other STEM areas. Also, the urge for boys to measure strengths against each other, physical or mentally, may be a drive for more involvement in games that are more directed into exploring the physical environment, in effect enhancing spatial capabilities.