“It is a characteristic common to all the perversions that in them reproduction as an aim is put aside. This is actually the criterion by which we judge whether a sexual activity is perverse – if it departs from reproduction in its aims and pursues the attainment of gratification independently.”  Sigmund Freud, A General Introduction to Psychoanalysis (1920)

“I believe that any such [contraceptive] practices would in time lead to unsound women & would destroy chastity, on which the family bond depends; & the weakening of this bond would be the greatest of all possible evils to mankind.”  Letter from Charles Darwin to Charles Bradlaugh (6 June 1877)