No, it's not a porn. It's a film about a bizarre contest in which participants keep one hand on a pick-up truck for as long as possible. It's a somewhat older film but has a big reputation (deservedly, in my opinion).
I had no idea that grabbing a fish and letting it chomp down on your arm was an accepted (though rare) method of fishing. You learn all about it and get to know some of the best noodlers in this doc. They're interesting people.