In classical Rome, Cicero's "On Friendship" and "On Duties" became "handbooks and guides...through the centuries", and Ovid wrote "Art of Love" and "Remedy of Love". The former has been described as "the best sex book, as valid for San Francisco and London as for ancient Rome", dealing "with practical problems of everyday life: where to go to meet girls, how to start a conversation with them, how to keep them interested, and...how to be sociable rather than athletic in bed"; the latter has been described as containing "a series of instructions, as frank as they are ingenious and brilliantly expressed, on falling out of love".