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kronix:
That (i.e. "Yuri" for all GL, "smut" for marking as explicit) is not how the tags were
usually traditionally used, at least on Batoto or MangaUpdates (the origin of this tag set).
(Also: Not all graphic sex is smut; not even all
gratuitous graphic sex is smut. Smut refers to a very particular sort of vapidity of plot in relation to the portrayal a physical relationship).
There's a long and storied war on the definition of "yuri" and "shoujo-ai" within the scanlation world. Both sides have reasonable arguments coming from very different places (TL;DR: Some want to use "yuri" as it's used in Japan—to refer to roughly all GL—but "yaoi, "shounen-ai", and "shoujo-ai" are all misappropriated loan-words already in English, that have very little to do with the equivalent Japanese terms, and so using"yuri" correctly as a loanword produces nonsensical results if those are the four terms you're using), but the end result is that the tags are currently used unpredictably between different people, which is very unfortunate for people who want to know what they're going to be reading.
...
Honestly, I haven't even seen anything that I'd classify as shoujo-ai in this, yet? Just blatant GL subtext. There's just barely enough material open to the interpretation that Saotome loves Ten romantically, that I'm not going to consider removing the shoujo-ai tag, but I personally think it's stretching it. Unless someone knows from the raws or some such that either of the characters ever reveal any specifically romantic sentiment.