XF 1.5 allow some posted images always only to a specific usergroup


Hello, on my vbulletin based forum back in 2010 I did the following mod:

on my forum we talk about markets and finance, but some users are used to post sexy girls and nudity.
This is a problem for Google Adsense, so I gave to these users the possibility to hide those images to the other users, and visible only to them.
These users belong to a specific usergroup.
They normally post the image, and after the publication they press a button, that is near the image, that change the permission of that image, and allow only that specific usergroup to see the image, and noone else.

I am switching to Xenforo now, and I need at least one thing: allow those images to be visible only to a specific usergroup.
Starting from now I will ask users to avoid posting sexy images, but I need to avoid thousand of images to be visible to Google on the new xenforo based forum.
How can I do that?
Thanks in advance.
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