My natural hair color before 40-45 was red. Neighborhood boss lady called me carrot top when I was a kid. Now it is white. Pubic hair and armpit hair is still red. I'll catch my wife every now and then playing with my armpit and pubic hair. I have never had sex with a natural red haired girl but friends have said they have the best pussy, even better than blond. Black hair seems to be rated coarse and less desirable. However I've never turned down a girl because of hair color.
I agree. Red head women have small inner labia. Also, they tend to have very little hair on their outer labia and none round their bum holes.
That is because red hair is less dense than brown hair, fewer follicles per inch of skin, basically. But I have to disagree about flat nipples, mine are puffy.