The word is based off of a combination of art and sport, because they are artsy sports. Judged on artistic quality and not physical ability.
Bob: Really, It's more of a spart. It's got this artsy thing going.
Sparting is accomplished upon the anal deposit of a man's ejaculate and the receiving partner's subsequent flatulence which expels the mixture.
He blew the load all up in my butt, you best believe that ima spart it out.
My panties were soaked in the back. I did have anal sex, so I'm guessing I sparted.
Sparts have a slightly discomforting obsession with abolishing "fascist" age-of-consent laws, and are occasionally shunned as some sort of Marxist-NAMBLA.
It can be improved by drinking copious quantities of Guinness and raw eggs.