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Hi

I'd like to know if you know some movies with several couples shagging in the same time.

Do you know movies or porn companies which shot this kind of movies?

I don't know any company that 'specialises' in orgies.
Such scenes are fairly common both sides of the Atlantic but tend to be just the one [usually final] scene in a bunch of otherwise one-on-one encounters, although Puaka films on this side, and the Orgy World series in the US, might be worth a look.

I'm afraid in the end you'll have to resort to scanning boxcovers to find something that appeals.

EroMaxx - Mad Sex Party, Drunk Sex Orgy series.