I'm assuming something happens because it's tagged erotica even though it's barely even done enough to warrant a suggestive tag.
The ratings don't have the hardest definitions, and they're user-submitted. So, it happens sometimes that an entry where there's hardly any nipple-less breasts one time gets shot up to "Erotica", but also times where you can have a full-frontal single pager of someone masturbating and it stays "Suggestive". Sometimes, a rating is given because the person submitting it knows what's coming up, and sometimes
nobody cares to update the rating despite what's already been posted.