Real orgies have never been group-like. They ate, listened to music and spoke secularly. But next to the participants was lying (they ate there lying) a maid for care (in the sense - she cared for the guest, the wines there, or lambs on the plate to report), and if desired, you could also fuck with this maid, without embarrassing the rest. This is an additional non-optional option.
And then to solidify in the choir the beginning of Christianity with its cult of celibacy and chronic lack of purpose, this is the beginning to spread fiction about orgies, and then about pagan shabashes - since the untargeted cultist of celibacy simply did not imagine that with free availability is not so often the people were and need it. The hungry man does not understand.