It is NSFW due to the fact that it contains an image of the password reset screen at a porn site.

The reason it contains this is to illustrate that, if your services says "We have sent an email" vs. "User not found!" then it can leak the information that an account exists for a given email, which may perhaps be embarrassing given the content of the service -- especially if it tells you your User ID.

screenshot of porn site with nudes.

Er, except they're not nude. Suggestive, yes, but not nude.

I was in my garden, the sun was on the screen. Looked more-or-less nude from where I sat.