To add a little detail, I'll mention that the relevant portion of the satire in question, Satire VI, "The Ways of Women", goes:
"I hear all this time the advice of my old friends--"Put on a lock and keep your wife indoors." Yes, but who will ward the warders? The wife arranges accordingly and begins with them. High or low their passions are all the same. She who wears out the black cobble-stones with her bare feet is no better then she who rides upon the necks of eight stalwart Syrians."
Juvenal had a sharp pen, upon which he skewered the wicked ways of his fellow Romans. Like all satirists, of course, he paid more attention to vice than to virtue, since vice was grist for the mill.