Someone who enjoys a primal play or even identifies as having a primal fetish or primal kink is called primal. In regards to that, this person has a tendency of behaving in an animalistic way, a rough way. It is a sexual preference that allows a primal to connect with their animal side, the inner side. It basically focuses on raw feelings evoked by impulses and urges that come naturally.
Many people find out they are primals by having this side enabled through the love for rough sex. In BDSM, usually the Mistress tempers the slave and helps him understand and embrace his need for biting, hair-pulling, grunt and growl, wrestle or scratching. Of course, the mistress is in control and the primal is her slave.