Some of these are so strange. Some of the licenses prohibit basically anything that would contain the stock content purchased because the content itself would pretty much automatically require that the project be indecent or whatever.

Even simple stuff like a "Warning, Contains Adult Content" banner, which can be bought on pretty much any of these sites.  You'd pretty much have to use that with content that would be objectionable, no?

And many sites contain photos with "indecent" nudity (as opposed to perhaps just artistic nudity). It would be difficult to see how some of those models/photographers/stock sites could object if paired with other content of the same nature.

Granted, that's not the kind of thing the photographers on this thread are worried about, but it does seem odd.

I like the idea of stock sites providing additional labeling for content that doesn't mind being used in these contexts.