The absolute smartest or absolute dumbest threads tend to generate the fewest responses for obvious reasons; some threads are just too intelligent for most people to understand them, whilst others are so painfully stupid that no one will bother with responding. I suppose that dumb threads generally receive a disproportionally high amount of attention, both from people who actually enjoy the stupidity and exasperated others who add comments anyhow. However, intelligent threads can and do receive attention, though perhaps not often enough to drown out the less intelligent ones.
Is it just a horribly funny coincidence that sex-related threads are oftentimes the most successful at reproducing?