Hentai of underage persons. A lot of the time they'll try to pretend it's not by dressing it in a fantasy or scifi setting but that's what it essentially is. I personally see it as cp

To everyone saying just block the communities:

1. I don't want to have to block communities. In order to know I need to block a community, I have to see content which I feel is worth blocking. That's fine for most cases but in this case that is not fine (to me personally).

2. I don't necessarily want to associate or interact with people who are fine having a server with loli as their home server. Not to be mean about it but that's just how I feel flat out.

I think this is an instance where de-federation is the correct course of action.

Scroll to the bottom of the page and click 'instances'

Cataclysm: Dark Days Ahead