@Crumbly Writer
Technically, given the old settings, 16-years-old did NOT qualify for the "Extreme" label (those were typically snuff or gay content, which already had their own tags)
I was talking about Bookapy, not SOL. No tags on Bookapy.
There's a field where you define the age of the reader audience, like "any" or "over 13" or "over 17" or "Extreme." The last is used when a character having sex in the novel is under 18 (the minimum age for a character having sex on Bookapy is 16).
So even if the content in the story isn't extreme, if the character is 16 then "Extreme" must be used. A romantic love story between a 16-yo girl and 17-yo boy is extreme in that field on Bookapy. Nothing to do with the content.