You can always use it for good, you know. ;)<p>The Instagram API returns an APINotAllowedError (response code 400) when you search for one of these hashtags. I'm using it to automatically identify and categorize NSFW hashtags for one of my projects, HashPix. You can see it in action at <a href="http://hashpix.herokuapp.com/" rel="nofollow">http://hashpix.herokuapp.com/</a>
This list contains eg. both #sex and #thesexpistols. It seems more likely that anything containing the substring "sex" is banned. The list, then, is just examples, rather than some exhaustive, official blacklist.
Why is #thinsipration banned again?<p>In a country with 35.7% obesity (e.g. 203 pounds at 5'9" = obese), you'd think it would be a good thing to let people inspire others to get back to normal weight.
Looks like a clear case of the Scunthorpe problem:<p><a href="http://hashpix.herokuapp.com/s/scunthorpe" rel="nofollow">http://hashpix.herokuapp.com/s/scunthorpe</a> (thanks @DjangoReinhardt!)<p><a href="http://en.wikipedia.org/wiki/Scunthorpe_problem" rel="nofollow">http://en.wikipedia.org/wiki/Scunthorpe_problem</a><p><i>(EDIT: still can't format comments correctly)</i>