I was watching a porn video clip on xtube, and i

I was watching a porn video clip on xtube, and i saw a hairy muscled and stashed guy sits on a HUGE dildo which goes ALL OF IT inside his ass I wonder if this thing hurts? or even does a damage to his colon and his internal digestive system? i was watching the expression on his face, and he was in pain so why this stupid hairy guy is doing this to himself? what's the point?