Not sure exactly what you mean, but as a redhead, I do love oral both ways. But I don't think that proclivity is limited to us gingers.
I have found that generally, redheaded women are enthusiastic and demanding lovers. They give willingly and expect the same in return.
We’re all the same when the lights go off. I don’t see how it could matter. My wife is a brunette, so I have to say brunette‘a are the best. But thinking back, I think every girls/woman I’ve ever been with was a brunette. Even the “bottle blonde” ones.
Can only speak from experience here. Ex, (a red) many years ago, was older w/kids, once said the longest she'd gone without sex, since 17 (34 y/o then), was one month, even after divorce. Was a master (mistress?) at sucking my brains out. Flirted like crazy with any male, broke me of any youthful jealousy tendencies. Current (red) spouse-unit (for 34yrs now) had one BF before who basically abused her, forced anal and oral. First time we kissed in a true romantic relationship, I thought she was going to suck my tongue out of me! Turns out he was smaller dick-wise (like a tongue) and when she first saw mine (average size, kinda thick) she was intimidated. Once much later I asked her, while she was doing me, "You like sucking a dick don't you. She said, "Didn't before. I like sucking yours. It fits my mouth." FWIW.
Well, anythingonce, as Benjamin Franklin wrote regarding older women, "In the dark, all cats are gray." Also, to paraphrase him, "The lower areas remain as plump as in youth."
Ah, when I was young, all my limbs were limber Did I say all? Yes, all buy one And now I'm growing old and all my limbs are stiffer Did I say all? Yes, all but one