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I think certain tags like 'cum' are useful because people can exclude tags like that from their searches if they want to, but still be able to search explicit images. I'd be for the tags Aoie has listed (ie, the major stuff) but also for keeping certain very descriptive tags that are useful for inclusion/exclusion seaches, mostly stuff that some people wouldn't like, such as cum, tentacles, maybe pee for the few images like that here, and so on.
Other tags like ribbons or whatever I generally consider to be superfluous though, if you want to search for specific stuff like that then danbooru is your best bet.