In the first book of Plato's Republic
(329 b-c, tr. Paul Shorey), Cephalus is talking about old age. He says, "I remember hearing Sophocles the poet greeted by a fellow who asked, How about your service of Aphrodite, Sophocles -- is your natural force still unabated? And he replied, Hush, man, most gladly have I escaped this thing you talk of, as if I had run away from a raging and savage beast of a master."
One wonders what Sophocles would have thought of the modern pharmaceutical industry, which makes billions of dollars from a product (sildenafil citrate) designed to unleash that raging and savage beast.