>>52743446Japan's no BO gene reduces smell but doesn't reduce the importance of good hygiene for health reasons. Since hygiene in a social animal is relevant to their group, and smell is the predominant method of detecting poor hygiene, people there adapt a more sensitive sense of smell for things, especially biological matter to do with the human body. Like poop. The gene does nothing to the strength of the odor produced by poop, so Japanese people enjoy regular stench poop smell with a nose calibrated to magnify the subjective stench of it. Over time, this has led Japan to make the concept of odor and being dirty as it's most common form of basis for insults, as well as for a lot of its cultural sense of humor. Basically, Japanese peoples unique adaptation combined with their heavy genetic isolation was the justification used by me to make everything written here up including this next part where I say that those two factors combined with the natural process of odorous defecation drove them to be driven insane by the smell of their own shit.