"All methods involve some unnatural element intruding into the course of marital union. What is natural about imprisoning “couples in a casuistry of methods, and forc[ing] them to discover tricks in order to dodge and escape the letter of the official doctrine”? Isn’t it obvious that the distinction between “natural” and “artificial” almost disappears, becoming very imprecise and blurred? “The act that becomes ‘safe’ by means of a computation of days or by mastery of the will is in every instance not natural, unless one plays with words.” Therefore, both practitioners of “natural family planning” and users of contraception are engaged in “planned procedures to avoid pregnancy that require communication between husband and wife.”"