Now, I'm no historian. I was even raised Catholic. But. An entire empire, really?
So a quick read through historical viewpoints proves that a number of historians have pinpointed not just one but quite a few causes of Rome's decline from being the superpower of its time. Reasons like inflation, lead poisoning, the division of the seat of power, corruption, a crippling deficit (hint), even, OMG, Christianity which introduced contradictory values to running the empire. Sure there was certainly a level of debauchery that increased with Rome amassing power, amongst which were orgies of every sexual orientation, statements like this are meant to have us envision what? That Rome was essentially an amped up Fellini film spliced with racy episodes of Spartacus, something like Gay gone Wild?
The Roman Empire which incidentally wasn't actually even Roman, is as far as I'm concerned, a product of its time. There are lessons from the Republic today's governments can milk for value. It's marginalizing statements like this that distract from taking those critical points into the current, and refuse to leave the past where it belongs.
Unless. In some brilliant ploy to deflect the heat, Berlusconi's spin doctors finally threw their hands up and said, "When all else fails, blame the homosexuals."