MLB slugger David Ortiz may finally get his X-rated wish ... in the form of a REAL $100,000 SEX TAPE OFFER ... after Big Papi revealed that he's always wanted a secret career as a porn star.
In case you missed it ... the Red Sox legend told the Player's Tribune that if he wasn't an athlete, his dream job would be "Porn Star."
Well, Vivid Entertainment -- the company behind the Kim Kardashian sex tape -- wants to make Ortiz's dream come true.
We spoke with CEO Steve Hirsch who tells us his people are already drafting up an offer for Papi's big debut ... complete with a working title.
Hirsch says the flick would be called "Big Papi's Slugger" and would feature Ortiz hitting it out of the park with 4 or 5 women at a time because "his personality is too big for just one."
Look, we all know the $100k is chump change for Ortiz, but he also told Players Tribune his favorite song was "Baby Got Back" ... so we're guessing he'd accept other forms of payment if interested.