“All women except one–your wife–are in the category of mother, grandmother, sister, daughter. Your girlfriend or fiancee is a ‘sister’ first of all and should be treated as such. All men except one–your husband–are in the category of father, grandfather, brother, son. Your boyfriend or fiance is a ‘brother.'”  David Powlison and John Yenchko (quoted in Trained in the Fear of God, p. 225)