Each attractive female has what he’s after, because male hormones push for sex. When sex is cheap, he looks for easy stuff rather than spin wheels screening for the female of his dreams.
Her rejection spawns bitterness, aggression, and violence. Rejection imagined as extremely personal turns boys, and those men who can’t handle it, toward extreme aggressiveness and even violence.
When No Sex without Marriage is the strategy used by most women and honored by girls, males do not so easily take rejection personal. If rebuffed, they assume her character and moral standards reject his invitation, so females are not rejecting him personally.
This turns men away from sex for its own sake and pushes them to compete for a woman with sex as follow-on. This requires and males accept that they suppress aggressiveness and violence. They make themselves more female-friendly.
In this way, the sexual habits of most females stifle male aggression and violence toward individuals.