why does aunt lydia use instead of the saying "all flesh is weak" ? does she really mean all humans? how about women?

Aunt Lydia alters the Bible to support her own purposes. She alters 1 Peter 1:24: ‘For all flesh is as grass, and all the glory of man as the flower of grass.' She changes it to All flesh is weak. Offred knows that Aunt Lydia has changed the quote to warn women away from sexual temptation.