Porn Star Brooke Haven -- I've Got a Crazy Story About an NFL Star ...

Porn star Brooke Haven -- star of "Assploitations 5" and "I Wanna Bang Your Mom" -- says she's hung out with TONS of athletes ... but there's ONE who parties harder than everyone else ... by far.

Haven -- who also appeared in "World Poke Her Tour" -- says the rager is an NFL star who still plays in the league.

The guy happens to be married with kids now ... but according to Haven, years before the athlete became a family man, the NFLer had one helluva wild side.