Amazon spokesman Drew Herdener's explanation:
This is an embarrassing and ham-fisted cataloging error for a company that prides itself on offering complete selection.
It has been misreported that the issue was limited to Gay & Lesbian themed titles – in fact, it impacted 57,310 books in a number of broad categories such as Health, Mind & Body, Reproductive & Sexual Medicine, and Erotica. This problem impacted books not just in the United States but globally. It affected not just sales rank but also had the effect of removing the books from Amazon's main product search.
Many books have now been fixed and we're in the process of fixing the remainder as quickly as possible, and we intend to implement new measures to make this kind of accident less likely to occur in the future.
However, I see nothing there that indicates they are not going to try to interfere with what comes up when we search--just that they did it badly this time around. I don't want Amazon protecting me from porn or dildos or vibrators appearing as a result of my search. If I'm stupid enough to do such searches at work, I get what I deserve. If I'm stupid enough also not to pay attention to my grandchildren's computer usage in my home, again that's my fault. I don't need Amazon to be my nanny or theirs. I don't want it to influence sales and future publishing trends by making some items and books harder to find in this way, no matter what books or products they are, even if I find them offensive myself.