NSFW - Not Safe For Work. Depending on where you work, that could mean a lot of different things.
Luckily, we're defining it here so you don't have to guess.
- Explicit porn is NSFW.
- Boobs, including nipples, are not.
- Vagina, penis, testicles are NSFW.
- Bare butts are not.
- Any oral/genital contact is NSFW.
- A completely nude model with a hand covering her goodies is not.
Think of the European attitude.
Ask in the comments if you need clarification.