You don't have to be looking for it... You just aren't federating with the instances that post it. In my case, tchncs.de federates with lemmy.nsfw. Because of this I do see porn in the all communities tab.

there is no algorithm here in charge

I think that's the most refreshing and underrated thing about Lemmy. I have seen that sometimes when I come back, I see repeat posts (which I have not read). I then close Lemmy, telling myself "I'll just come back later I guess".

Any other social media or Reddit front-page has gallons of content and "recommended communities/posts" which just keep your eyes glued to the screen for maximizing profits and degrading your mental health.

I hope this is promoted as a plus point whenever someone recommends Lemmy to others.