Uh google doesn't like porn. Their founders repeatedly have said they hate porn.
Google doesn't make significant money with adult traffic, so any term that it can get away with driving adult terms to sfw sites they do. And then lots of others that are pretty blatantly porn. If I type in "porn" half the results I get are news sites or Wikipedia type shit
They want the traffic to go to sfw sites that can run google Adsense.
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