How different from water does it have to be? Just not in the title?
Because both something like sparkling water and juice are basically water.
But I already pretty much only drink sparkling water so I'll pick that one if it's allowed (if the spirit of your question is "no flat water").
Lemmy should add something that differentiates porn from other nsfw types of content.
Same with nsfl stuff to be honest.
I feel like there's three types of nsfw content that people either want to see or want to hide all of: porn, gore, other (eg drugs).
Having one tag/flair to cover them all was always a mistake for social media.