Yesterday I was browsing models ports here and I happened upon a port by a model who was 16 who's self shots really caught my eye so I looked at her port.
She has 2 images flagged "18+". Neither of which actually needed to be flagged, they were perfectly non-adult/age appropriate face pictures.
Later it dawned on me: She is 16, has her age properly entered in her profile yet was able to post images labeled 18+. That seems odd to me and makes me wonder about how the 18+ flag works here. I had assumed it meant that if I flag an image 18+ that MM members under 18 would not be able to view them, but if under 18 models can post 18+ images does that mean they can also view them too?
My question is does MM have a filter built in for under 18 members and 18+ images or is it strictly advisory?

I think you're worried about nothing.  I'm sure the coding is such that ANYONE can mark a file as 18+.  The question should be, if a 16y.o. marks one of their own photos as 18+, can they still view it?

Yep, being under 18, does not prevent you from viewing the 18+ photos.
I know because I changed my age to 16, hoping that it would block the IMO
dis-tasteful images. But alas, I can still see them.
Iris