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It could depend on time-of-day browsing habits. I’ve noticed NSFW stuff tends to appear more during the night time for the US and Europe. It’s still a small minority of posts overall, though, and I don’t click them enough to observe any trend in proportion of hentai in particular.
or depending of your instance? Or you still can see post from unfederated instances, I don’t remember, but that wouldnt make much sense
Your instance would only matter if it is small-scale enough that users haven’t subbed to the originating instances, if it has deliberately defederated from them, or if you are browsing by Local instead of All.