Try using the anti slip rug backing material which can be bought in K-Mart, Wal-Mart etc. It is sold to put under area/throw rigs. Place under throws, and fold and tuck under couch cushions when using throws. You could also try the shelf/drawer liner of plastic(looks like a web) by Rubbermaid. You can always line your drawers with it if it does not work on the couch and throw.
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