Newgrounds' content rating system is very clearly flawed and could definitely use an update in the age of NSFW content that doesn't just consist of sex.
Recently I encountered a piece of very obvious fetish art rated T. The fact that it wasn't E-rated means that the artist took the time to mark their art with a rating, but it wasn't correct at all. Nudity does not directly correlate to whether something is NSFW anymore! Newgrounds' age rating system needs a major redesign.
Here's my suggestion: Compound Ratings.
This way, people can see what kind of content they're in for before they click on the image.
Please note that these icons are quick-n-dirty programmer art and they're just there to gauge opinion on the matter. The descriptions are placeholders, too.
Category A: Nudity
Category 1A: Full Nudity / Sex
This content contains genitalia or depicts sexual acts. Simple as.
Category 2A: Partial Nudity
This content contains only partial nudity (e.g. breasts)
Category 3A: No Nudity
This content depicts no nudity whatsoever (depicted humans/anthro critters are fully
clothed, even if the clothing is less concealing than, say, a T-shirt and jeans)
Category 0A: Non-Applicable
There are no living beings depicted in this image.
(This rating should ONLY be applied if there are zero humans or
anthropomorphized beings in an image!)
Category B: Gore/Violence
Category 1B: Detailed Violence
Stabby-stabby blood blood death gore violence
Category 2B: Violence
(The icon is a water-gun. I'm not the best at icons...)
Violence that isn't necessarily gory (light blood fits into this category)
but is violence nonetheless.
Category 3B: Mild Incidental Gore
The gore in question is trace amounts of blood not resulting from actively
shown violence.
Category 0B: Non-Violent
This content contains no depictions of violence or gore.
Category C: Fetish Art
Category 1C: It's Porn
You drew it to jack off to
Category 2C: I Can Show It To Timmy!
You can show it to Timmy, 7, both morally and legally