There should be an option in your user settings to, “show me NSFW content.”
Also, as other commentors said, depending on what instance you’ve signed up on the porn could’ve been defederated.
Also, presuming you’re on lemmy.world, there aren’t that many large porn communities on this instance. You won’t see much porn if you scroll through local but you’ll see a lot more on all.
Lastly, if you want to go directly to the porn, one of the more larger porn instances is Lemmynsfw.com
I have made 3 comments on Lemmy these past few days. It isn’t much; I’m mostly a lurker. But I’d average like 3 comments a year on Reddit so I’m doing pretty good myself.
He’ll put his foot up your ass if you approach the table!