because those are masculine interests, and men have very basic, primal interests.
Among them, food, fighting nature (represented by The Apex of Struggles- the biggest animal around you can kill for status and food), things to stimulate the need for utility and curiosity (technology), and violence.
It's kind of why rock and metal are what they are. It's just letting the male brain and imagination run loose. And a man is a man. Making babies is one of those things you don't admit to out of fear it'll horrify your lady friends into thinking you are something you aren't.