It's not a matter of keeping tabs on every possible cultural taboo. True outliers aren't the issue here. Be aware of common issues for the audience of the website you're posting on, and label appropriately. Given the audience for HN, nudity of any kind, sexual content (including text), and profanity in audio/video are all issues for a large enough percentage of the audience that they should have the NSFW label. (If you were not previously aware of these taboos, you are now.)
My own "workplace" is home; I'm a full-time parent, and not at all worried about being fired. But I recognize the issues that are common for others, and label my posts appropriately. Please have the courtesy to do the same.
The first clue on common issues being this site is in English. Not to take an Anglo-centric point of view, but odds are the overwhelming majority of HN readers work somewhere with Western workplace values.
(Correct me if I am wrong, but I believe the 'NSFW' tag is quite appropriate in all the main English hubs- USA, UK, Canada, Australia, probably even Singapore)
My own "workplace" is home; I'm a full-time parent, and not at all worried about being fired. But I recognize the issues that are common for others, and label my posts appropriately. Please have the courtesy to do the same.