I'm 50/50 on this, so I'll not vote, but I want to at least share my thoughts.
On one hand I generally like downvotes, because it makes it easier to identify bad actors & trolls. However, on an instance that's all about nudity and sex, it could become a tool for harassment towards original content creators, which could discourage them from actually participating here. And I think OC is something we'd generally like to see more of, right? Or if we go with people who may be not quite the model standard body type, or do content that may not be the most vanilla kink out there, then they may be discouraged simply by people being not a fan of it, and it being very visible to them. It's one thing to not get many upvotes, another to receive a lot of downvotes.
If this was a regular instance I'd easily vote for the downvotes, but here I'm rather leaning towards "nay".