They are stealing traffic from your websites.

Statistics say adult sites get around 100 billion hits everyday. Now there are 2.5 billion internet users and 50% of the users watch porn website.

One billion internet users must be watching porn sites 1 hour everyday.

1 billion people giving 100 hits everyday to adult sites = 100 Billion Hits Everyday to porn sites.

I think adult sites & porn sites must be getting around 200 billion hits everyday.