It was brought to my attention that Saidit has rules against pornography. Due to the fact Saidit is meant as an alternative for Reddit, this surprised me. These style of sites are meant to be a central hub for content. It shouldn't matter if a person doesn't like a sub or not. It should be allowed on the grounds that the sub moderator ensures the content remains within the 18+ range. You guys already allow adult content with subs like s/WatchPeopleDie, so it doesn't make a lick of sense to forbid porn since technically graphic content can also cause legal trouble if enough attention is brought to it. I say, have some faith in the sub mods.
And remember, Reddit banning subs is part of the reason Saidit exists. Let's not follow their footsteps of censorship.
Lastly, if you don't want porn in your feeds, you could always implement a system similar to Reddit's r/all r/popular. It works surprisingly well.