Some males can contain this urge, while others go out of their way to fufill it. The other male instinct is to protect every female under his rule. Well, nowadays females rule males for the most part, but the urge continues. Males want to protect all women they care for, from wives, to sisters, to friends. Issues and Problems Males can't be everywhere at once, unlike the dominant male monkey.
Men have to work and follow other responsibilites, as well as the women.
So when other males attempt to steal one man's female, he is unable to properly declare his territory. He gets mad when he hears about these things. This leads to unnessisary stress. Men must be allowed to declare their territory, like the dominant Monkey would, by screaming at the other males. They naturally mate with many monkeys and thus form no favour or bonds with any particular one.