Greetings from another mostly-NSFW instance (but for furries).
You'll want to make sure you have a pinned post that's SFW with links to recommended NSFW communities. That's because people who are logged out can't see NSFW communities in the list and without you having another place to announce those communities they will be impossible to find by users of other instances.
By the way, users, registered on other instances still can’t see the list of communities from the link that have been shared. They can see only the one SFW community on that list. It seems, that if you want users to be able to subscribe, you should manually create a list with a list of links to the communities.
Moderation will be important for porn communities, so perhaps just start out with some kind of "meta" community where you can discuss stuff about the instance itself. May be better than throwing down a bunch of communities and ending up "stuck" having to deal with them.
Until you create some communities, nobody can post unless they sign up on your server. Since most of us are already signed up elsewhere, that doesn't make much sense.
A sidenote - jerboa turning these community links into email addresses gets a little annoying for me, keeps opening my email app. Fingers crossed it gets resolved eventually
jerboa's search function definitely does need some polishing but in all fairness Reddit is pretty infamous for its absolutely atrocious in-site searching.