. >> it appeared that he was interested in homosexual sadomasochism, and he was interested in being thesubmissive partner. >> reporter: steve huff is a crime blogger and a contributor to the "true crime report." following up on the e-mail address markoff reportly used, "sex addict 5385," huff made a startling discovery. >> i received a tip that if you added another "8" to that address, there were secondary profiles that nobody knew about yet. >> reporter: and here is one of the profiles huff found for sex addict 53885, believed to be markoff, on alt.com, a personals web site for the very adventurous. it lists these among his interests-- chains, collars, leashes and experimentation with transvestites, among others. >> everybody answers questions on these profiles. one of them was, "how often do you think of these things? and he answered, "all the time." >> reporter: and it's not an isolated entry. it looks like markoff was all over the internet. >> reporter: philip markoff had profiles on gayclublist.com, extremerestraints.com, and alt.com. >> reporter: how certain are you that the fello