The genital activities of mankind are so natural, so necessary and so right: what have they done to make us never dare to mention them without embarrassment and to exclude them from serious orderly conversation? We are not afraid to utter words kill, thieve or betray ; but those others we only dare to mutter through our teeth. Does that mean that the less we breathe a word about sex the more right we have to allow it to fill our thoughts?

Michel de Montaigne - Essays, On some lines of Virgil (III, 5)