As TMZ first reported, YouPorn.com loved McKnight's first foray into the dirty song business so much, they asked him to pen a track for them ... which he did.
But sources at YouPorn.com tell TMZ ... the first video for the song they posted, which just featured girls in bikinis, was pulled from YouTube for alleged "inappropriate content." We're told the comments on the video came mostly from McKnight fans upset about the song's subject matter.
YouPorn.com rep Corey Price tells TMZ they re-posted the video with no girls at all -- just the song -- and it STILL GOT PULLED!!!
Price tells us, "I can't believe with all of the crazy content that is posted to YouTube on a daily basis that THIS video of all things is being pulled repeatedly! Apparently you can show videos of bomb making and people killing kittens, but a bunch of hot girls dancing around in youporn.com bikinis is outlawed."
Sounds un-American to us.