It's open to question whether "evolution" has made our males bigger and aggressive or whether that's sexual selection affected by social conditioning.

When daintiness and delicacy is considered attractive in women and not in men, and when size and strength are considered attractive in men and not in women, small slight men and big burly women don't get selected. When aggression is praised in little boys but not in little girls, you're going to get men who perform aggression and women who don't -- even if their behavior was identical as small children.