(TMZ) A man claiming to be James Holmes created a profile on a popular sex website just days before “The Dark Knight Rises” massacre … in which he described his penis as “short/average” … and law enforcement sources tell TMZ investigators are now looking at the site to determine its authenticity.

“Holmes” created the profile on AdultFriendFinder.com July 5 — and included a picture of himself with reddish, orange hair … just as officials in Aurora, CO said he looked when he was apprehended Friday morning.

“Holmes” — who used the screen name classicjimbo — included a cryptic message on the top of the profile which reads, “Will you visit me in prison?”

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