Yeah: they also tend to be a lot more security-conscious: if you're going to pick up driveby malware, it's more likely to be from your neighborhood church's web site than a porn website.
There's lots of money in porn. If you're operating a site, you tend to avoid things that will interrupt access (like failing to pay bills on time) - since doing so will interrupt your income - and avoid things that will antagonize your users (since potential users have a lot of choices on where they can scratch their itch).
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