There should be a setting on the reddit home page to turn on or off NSFW content.

There should be a setting on the reddit home page right next to *view* and *sort* for SFW, MIXED, and exclusively NSFW subreddits. People use their reddit account for different reasons. Some like to keep up to date on politics or science, while others have admittedly less wholesome pursuits. Subscribing so some of these less wholesome interests however can limit your reddit usage in places like your place of work, or on your cellphone on the street car.

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A menu option could fix that by turning off any NSFW content while activated, making it safe to browse communities or subjects related to their fields, or when they're feeling less wholesome, turn off everything else that way their private time isn't interrupted by The Donald or Tsar Putin. There's a time and place for NSFW content. And the more reddit can do to facilitate that, the more it can appeal to the needs of uses of all its users.