Bodies are different. ¯\_(ツ)_/¯ Diets also affect different bodies differently, can impact body odor. I typically only shower every few days. And I don't usually wear deodorant (more often do in summer or when about to do some physical activity out). I use a bar soap (same soap I use for my body) to lather my scalp every few weeks but otherwise just wash my hair with hot water. I still get told that I smell great and that my hair looks great. I just don't sweat that much I guess. My wife seems insanely jealous of my lack of need for deodorant. She gets pretty ripe without it :P

What I don't understand is that there are apparently dudes who don't wash their butts because they think it's somehow... gay? Gotta keep clean down there! Now that's some basic hygiene!