Brian McKnight Records Theme Song for Porn Site The R&B singer has found an enthusiastic audience for his explicit material.

After shocking fans with his explicit new song "If You're Ready to Learn," Brian McKnight is apparently doubling down on his reputation as a hardcore songwriter extraordinaire. The R&B artist has recorded a new song for the porn site YouPorn, and an early leak of the track obtained by TMZ shows that it's far dirtier than "If You're Ready to Learn."

YouPorn was one of several porn companies to embrace "If You're Ready To Learn," which was initially posted on YouTube as a joke from McKnight to his Twitter followers. McKnight was also reportedly invited to perform the track at next year's AVN adult film awards.

After McKnight released "If You're Ready To Learn" to iTunes, YouPorn promoted it on its website, helping to create a spike in sales. YouPorn suggested that McKnight make them their own theme song as a thank you, and the 16-time Grammy nominee has now obliged.

The new track, which features the chorus "Head on over to YouPorn" and references big t---, round a--es and anal sex, is too explicit to detail here, but you can listen to an excerpt over at TMZ.