EXCLUSIVE

The guy behind the Kim Kardashian sex tape says he wants a piece of Draymond Green -- saying he was so impressed with Dray's monster penis, he's offered the guy a 6-figure porn deal!

Vivid Entertainment honcho Steve Hirsch fired off a letter to DG saying he saw the dong selfie Green accidentally posted on Snapchat over the weekend ... and believes it's the perfect centerpiece for a new celeb sex tape.

"Here's the deal: We will give you $100k to star in a porn called 'Drayzilla,'" Hirsch wrote.

"You call all the shots. You pick your co-stars and set up the scene however you want."

Hirsch says he adamantly believes the tape can "really make history."

It may seem like a cheap publicity stunt, but Hirsch is the go-to guy for celeb porn -- he's worked with Kim K, Chyna, Kendra Wilkinson, Pam Anderson and more.