@Wiimeiser
I decided to run some numbers on that subject, because I was genuinely curious.
So, by numbers on this site alone, there’s 120,816 images tagged with “shipping”, of which 63,729 are tagged “shipping, safe”, a number that rises to 72,625 if we consider images just tagged with “suggestive” not to be porn.
If we broaden our search to all art, there are just shy of one million and sixty-eight hundred thousand images on this site, and of those 292,995 are tagged either “questionable” or “explicit”, whereas 1,103,812 are tagged “safe”.
So, after crunching some numbers…
Porn of various levels of pornosity does, in fact, make up around half of all shipping images, which does make it a bit of a chore to find good SFW art of any given ship you might like.
As for art in general, though, porn makes up around 17.5% ([292,995 / 1,680,000] x 100) of the stuff on this site – a little less than a fifth. The remaining four fifths and change, while not necessarily SFW (since it could still be grimdark, grotesque or whatever else), are at least not pornographic.