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...