She never yet was foolish that was fair;
For even her folly help’d her to an heir.
– William Shakespeare
Othello, Act 2, Scene 1. In a conversation about women, it never takes Iago long to turn it into a discussion about sex. He says that women who are pretty and silly can still manage to uses these attributes to get pregnant. He puns on the word "foolish" as meaning both silly and lacking in chastity. Iago believe that the purpose of women is to have sex with men and have children.