The site doesn't allow cub artwork. I'm not a fan of it, but banning cub artwork splits the fanbase. It's the reason so many furries left to join inkbunny. If we want to make a site for all furries (which I'm hoping for), shunning part of the fandom (regardless how creepy it may or may not seem) isn't a great plan. I know some great artists that won't be a part of places like furaffinity simply because some of their work is cub stuff. I don't like that kind of work, but the site will have lost the rest of the great work they have to offer. Allowing users to block keywords would keep the cub artwork where they don't have to see it.
Also... Wow this sounds bad coming after my previous suggestion, but allowing minors to join the website. I've heard minors aren't allowed to join. I understand the adult nature of furry work, but locking them in a SFW mode until they turn 18 would be a relatively easy solution. If they can't join, they'll lie about their age and join anyways. Not allowing a certain age group to join makes the site feel like it's supposed to be adult oriented rather than building a community for all furries. Preventing minors from joining was one of the reasons myspace sucked.
I don't want to see this site die. Barring certain groups of people and content makes the site suffer. If 100% of the furries can't join, it can't be universally accepted and will fade away as another fad. Please don't let this happen.