Excerpt from the novel Kurt Vonnegut called "Very funny":
Real life and true sex, which I define as debauchery with a female who has played no role whatsoever in your coming into this world or in changing your nappies shortly thereafter--began for me in the convent. For there is little doubt in my mind that a black habit which hides twenty times as much as it reveals must provoke dark thoughts in the darkest recesses of the human mind, which, like a cat, is always provoked into curiosity by the hidden dimension.