I occasionaly edit nudes on my home computer, where my kids have access. Is there a way to keep these images hidden, their location hidden or have them not show in the library thumbnails?
I'd go with a separate catalogue.
If your kids are clever, you could use something like TrueCrypt (a free, open source encryption program) to create an encrypted disk volume that contains all those images and their associated catalog. You'd need to enter a password to make the "volume" show up in Finder/Explorer.
You could try this plugin:
It may help.
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