Charlie Sheen's Porn Pals Unite ... On the Pole

Some of Charlie Sheen's closest porn star friends are banding together to go on a strip club tour -- because if you can't be a goddess ... ya might as well strip. 

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TMZ has learned Capri Anderson -- co-star of Charlie's infamous night at The Plaza -- is hitting the road with Cassandra Cruz and Elizabeth Ann ... two porn stars who claim to have partied with Charlie.

We're told the "Duh, WRINGING-every-last-second-out-of-your-15-minutes" strip tour begins, naturally, on Long Island ... at a club called The Scene on March 18.