Hobie from "Baywatch" -- Don't Call It a Comeback!

Think of all the people from "Baywatch" you wish had a sex tape. Now think of Jeremy Jackson.

Yes, the kid who played The Hoff's son is all grown up -- literally. There's a sex tape being shopped around town starring Jackson and top Vivid porn star Sky Lopez.

We're told the tape is about 45 minutes in length, but so far -- no buyers.

We just got this statement from Jeremy: "Listen, this video was made by my best friend. Between me and a casual sex partner who just so happened to be a former porn star. I was later physically threatened if I didn't turn the DVD over to some drug addicted thugs.

"They said, 'Sky wanted it back and didn't want to ever be seen as a porn star, that she had turned to God and was changing her life.' So I gave it up for HER and so they would not beat me up and 'make my life hell' as they had threatened. I was blackmailed. This private recording becoming public kinda sucks. But I thought people out there should know the truth and how far some people will go to make a quick buck."