Since telling several sources that he once shared a wet, sloppy kiss with John Mayer, Perez Hilton has taken his allegation about the "definitely bisexual" musician to a new level.

During a lie detector test given by Us Magazine, the infamous blogger asserts that "yes", he was at Stereo Lounge with John Mayer and then-girlfriend Jessica Simpson in December of '06, "yes" he and John Mayer kissed ... on the lips ... with tongue, "yes" John Mayer initiated it, "yes" Perez pulled away first, "yes" Jessica WAS RUBBING JOHN'S CROTCH THROUGHOUT THE WHOLE THING, yes yes yes yes yes ... aaah!

Click here to watch the whole thing.

So basically one of three scenarios is goin' down:

(1) Someone taught Perez Hilton how to pass a lie detector test ... and he is doing this to get back at John Mayer for "taunting him in recent blogs"... like this one.

(2) Perez got Us Magazine to go in on his anti-John Mayer smear campaign

(3) It actually happened!!!!

John's publicist has already called Perez's story "completely ridiculous" and there has been no word from Jessica's camp, but the singer/actress will surely deny it. Whether the report is true or not, things didn't end THAT badly between her and John.

On a side note, if John really is "struggling with his sexuality", at least this will help Jessica understand why she got dumped!