Vaderisnothayden said:

Are you judging this only by deduction based on the films that come out or are you working off some information (inside or otherwise) that informs you that the studios have such a rule?

I know about it since a long time. Also working myself more or less in the same area, it doesn't surprise me at all. You've got always a bunch of (ridiculous) censoring rules to face working on productions. I'm sure it would be easy to find precise infos on the internet about that.