I mean, you don’t have to flag anything. It’s not mandatory. 
But if you do want to help out that’s also much appreciated too. 
Here’s the original topic on the rule change if anyone is interested:
Though I think it’s been in place a while now and I’m not sure it’s furthered the cause a whole lot. As the Your Photos category is restricted to logged-on users only it’s not actually indexable/findable by google or other search engines. I think there’s a strong case to go the opposite way and allow nipples for all.
Free the nipple!