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I would rate both images explicit so I don't see any problem there, but I can see what you are trying to say. We could even go with just shounen ai and shoujo ai and drop yuri, yaoi tags and people who don't want to see some hardcore stuff can just blacklist rating:e shoujo ai or shounen ai.

But still people are different so rating:q for somebody can be rating:e for another, I would still hold to my first proposal