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Even though the meanings are generally the same, many people have been using s-ai instead of yuri/yaoi for usual romance genre, and the latter for more explicit ones. Since that's the easier way to say it and gives a good idea of the content than saying "oh, I read this yaoi manga before and it's go-", then you got people saying you're a -if you're a male- weirdo because it's yaoi, rather than shounen-ai.
But if it is deemed that extra tags aren't necessary, then I guess that's fine. As long as there is a clear guideline on discerning which is which.

Radioactive said:
OK. Let's try this instead -

Yaoi - Explicit, Questionable and Safe scans with two or more males in sexy poses
Yuri - Explicit, Questionable and Safe scans with two or more females in sexy poses
This is fine, but "sexy poses" is a bit vague and subjective.