This term is commonly used in the gay male community to describe the act of having dirty sex. A man engaging in pig play may perform acts of watersports, urine colonics, defecation, tag-team sex, bareback, breeding, fisting, and cum swapping. A true sex pig is an insatiable anal sex addict.
Michael was not satisfied by vanilla sex, he needed serious pig play to get off.
"dirty" gay sex - W/S, scat, sweat, etc
He is a total bottom and loves pig play.