Admin for lemmynsfw here, I just wanted to chime in that I 100% agree and feel that this is a feature that needs be baked into lemmy as a software overall. People who do not want to see pornography need to be able to block it in some way at the very least. There also does need to be an overall differentiation between NSFW content and pornography as well, since it feels particularly problematic to not have a distinction between the two. I think it is likely that content warnings will come to lemmy though, but we will see. Our back-end team is currently working to figure this out to identify our specific needs as an instance, but it's an uphill battle. Hopefully connect developers add this feature at least to provide a temporary fix, and I hope other app devs follow suit.