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Sadomasochistic sex just got sexier ... as 3 jacked TNA wrestlers ripped off their shirts and put our photog in a camel clutch ... so he could put the move on his GF.

Here's how it went down -- our camera guy approached Robbie E, Jessie Godderz, and DJ Z and copped to "a wrestling fetish" ... asking for a few pointers in the bedroom.

The guys put our guy on all fours, and for some reason partially stripped down and gave him a lesson that ... well, kind of turned him on.