Though I have absolutely no evidence to support this, I suspect that gambling doesn't suffer the same, uh.. stamina issues, that porn probably does. I assume that the sustained stream of small amounts of currency would easily add up to more revenue for gambling than porn, resulting a larger market.

> 0.59%

I researched it and most sites seem to agree on the fact that at least 4% of websites are sex-related, seems a lot more realistic to me.

I think the study is classifying normal sex-related websites as "Content" and porn filled parkings domains as "Porn".