People post things like beheadings, all sorts of sexual assault (including sexual assault on children), and so forth. It's not just underboobs and dickpics.
Yes, like you said, there is brutal violence and child sexual assault material (CSAM) that moderators have to view. I worked at a non-profit to which Facebook, et. al are required to submit CSAM once detected on their platform. It's been a few years, but the quantity of content submitted from Facebook was truly disturbing.
People I know do not deal with this type of stuff. Maybe it is AI progress, maybe it is handled somewhere else.
But for $35k/year you would find here many people with great english and university education. And life skills to handle this, for example former police officer.
Adult nudity is 0.05%-0.06% of all content views. That is the same rate for violent and graphic content. This means people somewhere, are going through millions of pictures of graphic violence.
You could simply be dealing with the lucky team which just has to watch schlongs.