Men's tendency toward large-group dynamics fosters competition and system-building. Women's focus on one-to-one relationships, rooted in the mother-child bond, cultivates intimacy and emotional expressiveness. These distinct social orientations help explain many psychological differences between the sexes.

At the Big Five level, gender differences in personality appear small. However, breaking down the traits into sub-facets reveals more pervasive differences. For example, within Extraversion, men score higher on Assertiveness while women score higher on Enthusiasm, effects that cancel each other out at the broader level.

The consistent pattern of men committing mass violence is rooted in biological evolution. Men are wired for aggression and physical confrontation, a trait historically selected for by women seeking protectors. This is a biological reality, not a surprising social anomaly.

The loss of a male role model makes a boy more likely to be incarcerated than to graduate college. The same event has almost no statistical impact on a girl's life outcomes, highlighting boys' greater neurological and emotional vulnerability.

Men exhibit more variation than women on many traits, including intelligence. This flatter distribution curve means more men are found at the highest and lowest ends of the spectrum, explaining their overrepresentation among both CEOs and prison inmates.

When asked to imagine incestuous acts, women's disgust is uniformly high. Men's responses show a much wider variance. This reflects the catastrophic evolutionary cost of a single bad reproductive choice for a female (nine months of gestation) versus the far lower opportunity cost for a male.

Research shows that the same genetic predispositions for physical aggression (e.g., fighting) in boys can manifest as relational aggression (e.g., social exclusion, reputation damage) in girls. This highlights a common biological root for sex-differentiated expressions of aggression, which can be equally damaging.

The common belief that testosterone causes aggression is incorrect. Testosterone is converted into estrogen in the brain via an enzyme called aromatase. It is this brain-derived estrogen binding to specific receptors that directly activates the neural circuits for aggression in both males and females.

When police and media refer to a biologically male mass shooter as female, they erase the most significant risk factor for such crimes: being male. This ideological choice undermines necessary conversations about male violence and alienation, hindering crime prevention efforts.