In a lecture the speaker states that the Talmud references Romans sacking the temple and encountering the angel statues engaged in intercourse. Do you have a reference for this talmud quotation?
Said Resh Lakish, ‘When the Gentiles entered the Sanctuary, they saw (the engravings of) the cherubim joined together in an embrace. They took (the engravings) out to the marketplace, and they said, Should these Israelites - whose blessing is a blessing and whose curse is a curse (so they are so close to G-d) - be involved in such (erotic) matters? Immediately, (the Romans) debased (the Israelites), as it is said, (Lamentations 1:8) All who once respected her (Israel), debased her, for they saw her nakedness.’” - Talmud, Yoma 54b