Yeah but you are using piefed.social which doesn't have any NSFW communities, so the only nsfw posts are occasional random things.
If you go to https://crust.piefed.social/auth/instance_chooser and then filter by 'NSFW content available' you'll see the instances that allow NSFW communities. Of those feddit.online has been around the longest and will have the deepest back catalogue but any of them will be fine for casual browsing.
If you're after a mobile app check out https://piefed.social/post/1258559.