WWE Hall of Famer Tammy Lynn Sytch ... aka "Sunny" ... could be doing an entirely different kind of rear-naked choke in the VERY near future -- 'cause she's thiiiiis close to signing a monster porn contract. 

TMZ Sports has learned ... Sunny -- widely considered the very first "WWE Diva" -- has been in talks with Vivid Entertainment, the same company that produced Chyna's "Backdoor to Chyna" video.  

Vivid tells us the two sides have spoken several times and a 6-figure offer is on the table for Sunny to become a "genuine porn star" -- not just a 1-time sex tape thing. 

"After the tremendous success of Chyna, this makes total sense. Hoping we can work it out," Vivid honcho Steve Hirsch tells us. 

Read more here: 

http://www.tmz.com/2015/05/20/tammy-sunny-sytch-sex-tape-wwe-wrestler-porn/#ixzz3ah5puDiL