>>57001205>>57000411It's also that in north east asian historical beauty standards, that maintain to the present day, it's more acceptible for men to be a little darker or tanner since they're supposed to live a rougher life outdoors whereas for females it is never good to be dark; they must be pale as porcelain. Darker is lower quality in general as it implies sun tanned peasantry, but for men it's more permissible. "Black", as in African black, is way out.
You see this even in regular anime etc. that's not hentai; the boys might be a hair shade more tan than the females, even if in the show they're related. The typical hentai/NTR antagonist is hence always the fit type with dyed blonde hair and much more tanned skin than the female MC to imply he lives a more dangerous outdoorsy life than the sheltered cucked male character.