How can I add explicit tag to whole iTunes library?

I'm looking for a way to make all the songs in my iTunes library explicit.

Reason being that when I listen to a song downloaded from my library on my iMac to the library on my phone, when the song doesn't have an explicit tag, the song is edited on my phone. I do not wish to listen to edited music. The most of the songs on my computer are downloaded because they are mixtapes which are not available in the iTunes Store.

I think the fix for this problem would be either selecting all of your library and editing the explicit tag. If there was a way to do that.

Perhaps we could create a smart playlist to fix the library and always fix the library when new music is added to the library. If we could find a way to do that.

The problem with this iTunes match for your new music library is it is costing the consumer more money. They don't want you to download music anymore they want you to pay for it by streaming or buying it outright. Your old library will be useless because it doesn't work with the new software which is ran from the cloud and never on your device so you never actually own the song. You can't edit the info on the song you uploaded, you must conform to the rules of the machine.