Few men act theirs. If men got pregnant abortion would be legal forever. Man loves little and often, woman much and rarely. Men and nations behave wisely when all options are exhausted. Because cucumbers can't fix a car.
Men fight because of causes.
Causes exist that men may fight. Men growing up are rewarded socially for eating a lot. Men hate more readily than they love. Men have become the tools of their tools. I would never think of cheating.