Agreeableness
Agreeableness comprises traits relating to altruism, such as empathy and kindness. Agreeableness involves the tendency toward cooperation, maintenance of social harmony, and consideration of the concerns of others (as opposed to exploitation or victimization of others). Women consistently score higher than men on Agreeableness and related measures, such as tender-mindedness (Feingold, 1994; Costa et al., 2001).
If you look at the distribution of scores between men and women within trait agreeableness, you'll find male distribution peaks to the left and females peak at the right. therefore, the majority of females tend to average higher in scores of agreeableness than the male average