I think the 18+ tag is generally applied too liberally in my opinion. If a kid wants to 'git sum' then there's (rightfully IMO) no verification system to check and for every partner that asks for a pic (which I've never seen) there's a score that won't. If somebody under 18 can pass as 18 through writing, they will.

Meanwhile this misuse means that people who just want to filter out smut but are OK with violence or whatever else people happen to consider 'adult content' these days (which is completely arbitrary anyhow unless you're dealing very specifically with pornography (Which is strictly [i]the representation in books, magazines, photographs, films, and other media of scenes of sexual behavior that are erotic or lewd and are designed to arouse sexual interest[/i], which has a whole bunch of complicated points like 'designed to arouse sexual interest' which has led to a lot of historical vagaries in cases, although usually in child porn cases specifically the definition is applied broadly*). Note that this has nothing to do with violence or drugs, and really anything at the point of being considered pornographic would be exclusively in PM since it isn't allowed on the main site. If that is why the tag is there for you, specifically that, absolutely keep it there. I'm also not the type that likes these RPs, so it's useful for people who want to filter that out.

But the rest? I don't think it's necessary or something that provides any real benefit. There's plenty of adults that don't like dealing with real world bullshit (i.e. violence, discrimination, etc.) and should avoid that roleplay anyhow, and perhaps there are some (if not many) children that can handle it. My strategy has been to include a rule saying that mature topics are dealt with in this RP including some vile things and if that's not your thing this may not be your thing. And if you don't deal with the topics maturely, the door's there.

I think dealing with the topics in terms of requiring sensitive sends away more immature people than the 18+ tag ever could. Of course, with age, I personally tend to adopt a 'don't ask don't tell policy' since I don't really partake in anything strictly (or, really, liberally) pornographic and no child should technically be here under 13 anyhow (at least without direct parental consent), and beyond that I'd rather not people have to watch things or 17 year olds feel particularly unwelcome due to any pretenses of needing to keep everything PG-13.

But that's me. Maybe I'm off-base for you lot, but the policy has worked for me.