Plato, Laws 840d

πέρι, διὰ κάκην δὲ τὴν τῶν πολλῶν εἰς ἀπορίαν ἐπέσομεν, φημὶ τὸ μὲν ἡμέτερον νόμιμον ἀτεχνῶς δεῖν περὶ αὐτῶν τούτων πορεύεσθαι λέγον ὡς οὐ δεῖ χείρους ἡμῖν εἶναι τοὺς πολίτας ὀρνίθων καὶ ἄλλων θηρίων πολλῶν, οἳ κατὰ μεγάλας ἀγέλας γεννηθέντες, μέχρι μὲν παιδογονίας ἠίθεοι καὶ ἀκήρατοι γάμων τε ἁγνοὶ ζῶσιν, ὅταν δʼ εἰς τοῦτο ἡλικίας ἔλθωσι, συνδυασθέντες ἄρρην θηλείᾳ κατὰ χάριν καὶ θήλεια ἄρρενι, τὸν λοιπὸν χρόνον ὁσίως καὶ δικαίως ζῶσιν, ἐμμένοντες

but have fallen into a strait because of the cowardice of the many, I maintain that our regulation on this head must go forward and proclaim that our citizens must not be worse than fowls and many other animals which are produced in large broods, and which live chaste and celibate lives without sexual intercourse until they arrive at the age for breeding; and when they reach this age they pair off, as instinct moves them, male with female and female with male; and thereafter