Felching is a sexual practice involving the act of orally sucking semen out of the anus of one's partner. The act of sucking semen out of a vagina is known as creampie eating.
Earliest appearance of the term
According to the 2003 draft entry for "felch" in the Oxford English Dictionary, the earliest occurrence of the word in print appears to have been in The Argot of the Homosexual Subculture by Ronald A. Farrell in 1972.
The word was subsequently used in the work of Zap Comix underground cartoonists, Robert Crumb, Rick Griffin, Victor Moscoso, S. Clay Wilson, "Spain" Rodriguez, Robert Williams in 1975. It was also used in 1979 by Larry Kramer in his novel Faggots, where he defined it as sucking the ejaculate from the anus after intercourse. It first appeared in scientific literature in 2005, when psychoanalyst Mark Blechner discussed felching as an example of the crossover between disgust and sexual excitement.
The Zap collective published two sexually themed comic books, Snatch and Jiz, and decided to continue pushing the envelope by publishing a book named Felch. According to Williams:
Crumb's contribution was a parody of an editorial cartoon featuring John Q. Public felching "Mother Nature/Lady Liberty" after she has had anal sex with a Pravda-style cartoon capitalist. Williams produced a felching-themed solo work in 1975 titled The Nectar of Satan.