It wasn't actually Bam who claimed there was a sex tape, it was an ex-producer on
The Opie and Anthony Show called Ben Sparks who started the rumor after being fired.
Ben took it to The New York Post's Chaunce Hayden (O&A had feuded with him in the past over some shit to do with Stern) who then published it as well as claimed to have seen the tape.
Ben would go on to continuously stalk and harass Opie until having a restraining order filed against him, this concerted effort and stories of crazy drug binges would lead to O&A fans labeling Ben as a 'good egg'.
Bam never claimed there was a sex tape and even called into the show to deny its existence as well as denied ever meeting Opie's wife:
https://youtube.com/watch?v=3A93ADL5pQ0:5268 (if the timestamp does not work, skip to 1:27:48 )
The New York Post then had to issue a retraction after being threatened with a lawsuit and Hayden admitted that he had never seen the tape. There's a brief TheSmokingGun article about it that sums up the situation:
JUNE 26--The fiancée of "Opie & Anthony" co-host Gregg Hughes has filed a $10 million defamation lawsuit against the New York Post over an erroneous gossip item claiming she made a sex tape with o
www.thesmokinggun.com