Amber Rose and Blac Chyna let their fingers do a lot more than walking outside a Hollywood nightclub — in fact, we can’t really say what they were doing … because we’re too classy.

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The ex-stripper BFFs left the Ludacris album release party at Project Club LA and hopped into the same ride … which was apparently so packed they had to lap up — with Amber on top.

We’ll just say they kinda held an impromptu sex ed class for fans and photogs — and everyone paid very close attention.

Moms MILFS do the darndest things.