Revelation 14:8

A second angel, followed, saying, "Babylon the great has fallen, which has made all the nations to drink of the wine of the wrath of her sexual immorality."

The above verse does not refer to the physical sexual activities of ancient Babylon, but to spiritual fornication with pagan deities. Specifically the pagan gods and goddesses that began with Babylon the Great, followed by Assyria, then the Greeks, and finally with Rome and the holy Roman empire (which consisted of the Roman Democratic style government and the Christopagan Universal Roman church).