The Sack of Rome

 ‘The Sack of Rome in 410 by the Vandals’, c.1890 by Joseph-Noël Sylvestre (1847–1926)

I somehow doubt that the Vandals were nude.  The Romans and Greeks famously despised them because they wore trousers.  However, the Teutonic and Celtic tribes would have been just as bisexual as the Romans, the Greeks and the Persians.  Hostility to gayness is a Christian/Abrahamic notion.  Man's natural state is bisexuality.