Never. No disrespect, but why would I put my mouth on an orifice from where litteral shit comes out? Someone's gonna have to explain this one to me, seriously!
Honestly, it's difficult to explain but to me, it's rather similar to DATY. One can easily make the argument "that's where shit comes from" but the retort would be "the vagina is where piss and menstrual blood come from", it's not intrinsically clean either. In the state of nature, it is unclean and we make it clean. It could be seen as a metaphor for taking the earth, clearing away the weeds and filth and rendering it arable and suitable for sustaining life. Or how civilization elevates a savage, barbaric ruffian from the state of nature where life is nasty, brutish and short into an individual who is productive, creative and full of potential. The metaphysics of eating ass, I know I sound high on my own bullshit right now, everyday proof that I missed my calling of either law or politics.
Thing is, I can more or less be defined as a clean freak. And nowhere else is it more obvious than in my extremely violent revulsion to fecal matter. No material in the world disgusts me as much as shit, if I were forced to stick my hand in a pile of shit or a receptacle of acid, I'd plunge it in the acid. If I were ever to marry, it would be stated plain as day in the prenup that I would never be required to change my spawn's dirty diaper. So how in the blue hell does that coexist with my love of female ass? Because if the woman's hygiene is above any reproach, then not only is her pussy clean enough to eat, but so is her ass. We wash our asses conscientiously because we are advanced enough to acknowledge that walking around all day with an asscrack full of filth is undesirable for both our health and overall comfort. Again, the transformative process of civilization that turns us from monkeys with shitty asscracks into proper human beings who can afford themselves the luxury of oral sex without the fear of catching some terrible bacteria or virus. So if I am aware that the woman I'm with is so conscientious with her hygiene that even her bunghole is clean enough for me to stick my tongue in it without concern, that just renders her orders of magnitude more desirable. Somewhat paradoxically, as a clean freak, the entire process strikes me as astoundingly erotic. Plus, the female asshole is like, small and cute and much like the Japanese, I have a soft spot for things that are small and cute.
Thank you for coming to my TED talk, "The Emancipatory Nature of Personal Hygiene Standards: From Hobbes to Voltaire to Eating Ass".