Good sex doesn't have to do with breeding; good sex is an act by which the woman causes pleasure to the man. Therefore good sex requires female pain as much as male pleasure.
So why doesn't 'Fifty shades' movie show Ana having an orgasm? For 2 reasons: 1º) Because 'Fifty shades' is not a Sci-fi movie; and 2º) because the point of Maledom is *MALE PLEASURE*, emphasized and asserted by female displeasure and pain