It's an understatement. Pornography sells more than anything else on the Internet, either directly or indirectly. This is an undeniable fact.

Here's an example: I go to PageRanker every few days to check the Google and Alexa rankings for my domain. Many times their "Random Profile" will show a porn-related website. They are ALWAYS ranked high on both charts.

I recently went to a popular blog directory because I saw the referrer in my statistics. The most popular blogs were porn-related. I didn't expect that.

I really don't need to be stating this, but I will just the same. Use a popup blocker, especially if you have young children around. Always. Unless, of course, you WANT porn popups.