Many institutions and even some countries have extremely crude, blunt blacklisting policies - banning or restricting access to domains that are deemed sexual according to very arbitrary rules. Particularly in education, government, etc.
I gather they pick up on things like sex-related keywords and images with a lot of flesh tones, and I gather it's not uncommon for health sites, normal forums and even classical art sites to end up blocked - and once blacklisted, it's very hard to get un-blacklisted. Many institutions also use whitelists where everything is blocked except domains that have been individually vetted for "inappropriate content" where the criteria for what is and isn't appropriate are very arbitrary and usually extremely restrictive.
While typing a question asking if research has been done on whether there was a risk of the
stackexchange.com domain ending up on corporate blacklists, I saw that this issue was raised the last time a site like this was attempted (2012) and was answered thus:
For private beta, the site will start out on the stackexchange.com domain. Recall that during private beta, the site is not indexed by search engines, or linked to publicly within the Stack Exchange network.
If the site makes it to public beta, then just prior to the switch to public beta, we will move the site off to its own domain.
Sounds good - it means this site wouldn't need to compromise its content, and no users of the other professional SE sites would need to worry about coming into work and finding a site they use for work has been blocked.
Is this still the plan for the 2015 version of this site?