Thinking like a librarian..... I discovered that wikipedia, yes wikipedia, even goas so far as to describe the sexual act you seek to learn about.
http://en.wikipedia.org/wiki/Double_dipping
Be careful though, not only does this colorful phrase mean removing the penis from the receptive person's anus and sticking into their vagina, but Wikipedia also notes that it refers to Canadian civil servants who simultaneously draw two pensions.
Of course, any enterprising Canadian adult webmaster could produce a content rich website starring "Ian" and "Barbara" alone at the Regina offices of Health Canada, who enjoy many lusty sex sessions of
Double Dipping Double Dippers
And if they have a four way, it would be Double Double Dipping Double Dippers.
And if the enterprising webmaster director filmed enough of this content to fit two DVDs, he could sell a Double Double Dipping Dippers Double Feature.
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