DMX -- This Dog Has NEVER Had a Bone

When it comes to oral sex ... X is NOT gonna give it to ya if you have a penis -- because DMX went out of his way recently to make it crystal clear he's not gay.

It's pretty funny ... DMX broke it down during a performance with Wu-Tang Clan members Ghostface Killah and Raekwon last week in Florida. He repeats several times that he definitely "f**ks with these n***as" -- but also adds a hysterical footnote ... regarding fellatio.

Or as the Wu would put it -- DMX's mouth ain't nothing to F with.