I can't speak for Kel, whom I adore, but for me there's no better intellectual sex study than "The Epistemological Dialectics of Rimming," written in 1993 by Prof. Janice R. Quinsmith, then of Oklahoma State University. I don't have a link, but I have the hard copy, and this segment will give you the, er, "flavor" of the piece:
"When considered from a prostrate position which, depending on the socioeconomic status of the rimmer, can be seen in exclusively post-dominant social terms, the nose and tongue are in essence stand-ins for the rigid phallus, itself the very symbol of patriarchal social relations within a late-capitalist construct. It is here, then, with the commencement of anal lubrication via the rimmer's saliva, that we begin to understand the softening up of the underclass which is often viewed by politically powerful as little more than an excremental opening to be violated for the sake of the perpetuation of the extension of capital and social control, first with light flicks, followed by violent penetration and expansion of the tissue that barely holds together the fabric of those who lack the kind of social acumen that is understood and accepted in prevailing ruling circles, and therefore are left with as a form of expression mere grunts and moans as the predatory class bores itself into the now occupied cavity."
DP