Readers be like

[Deleted member 84247]

Not really. It's just a meme.
This is how many stories are on SH.
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This is how many are tagged as Smut or Ecchi.
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It's a sizable portion, but not 'the norm'.

Some novels with smut or ecchi have neither tag. Some simply put "adult" in them, but I am not sure how many

 

[Cipiteca396]

Some novels with smut or ecchi have neither tag. Some simply put "adult" in them, but I am not sure how many

If you include every story with genres that might have sexual content in them, it ranges from about 200 - 250 pages. That's about a third of the stories, but that isn't really a fair sample.

And anyway, the real norm for the site is Fantasy. 486 pages.