This was a newspaper comic strip that first appeared in the 1930s. Later it became a radio program, a series of movies, and eventually a TV show that lasted only a single season. The movies and the TV show both starred Johnny Weissmuller (who also played Tarzan in several moves during that same period of time). Jungle Jim was a hunter, not a "noble savage" like Tarzan.
A guy called Jim gets on all 4s, another guy goes under and sucks him off.
Another guy is doing him up the arse while a 4th guy is having Jim eat his arse
Guy 1 - Im bored Guy 2 - Wanna try a jungle Jim?
Jim - Whats that
Guy 3 - You'll see