Why is this on HN?
HN is not just tech, it's for articles which are "deeply interesting".
This article is interesting because it shows how hard it is for one area of business to exist even though it's legal, and a normal part of everyday life for many (most?) people.
US attitudes to sex have a dampening effect on WWW, affecting sites that have nothing to do with the US. Regular, softer, sites face weird prohibitions. Meanwhile, American porn (often deeply unpleasant) is pervasive and causing some nations to introduce nationwide mandatory filtering.