I don't know. I rarely think to mark them since they're frequently automatically marked but I have seen things you'd think would be nsfw not marked that way but then some stuff that has absolutely nothing nsfw about marked nsfw. The system is obviously broken. Since those are windows it likely isn't recognized but you'd think the remark about the playboy mansion would inspire that to kick in. Unless it's militant nsfw with cursing, more blatant sexual stuff or violence I don't mark it and let the mods decide. I never mark poop memes nsfw since I'm sorry they just aren't.
