When Iago talks with Desdemona and Emilia in Act II, Scene 1 of Othello, he expresses his view that women are deceiving and hypocritical.
In this scene, Iago observes his wife, Emilia, being kissed by Cassio, and this seems to ignite his criticism of women. While Cassio excuses his "bold show of courtesy" to Emilia by saying that it is a custom where he comes from, the kiss contributes to Iago's jealousy and resentment toward Cassio.
Then, in his conversation with Emilia and Desdemona, Iago expresses his view that women are hypocritical, telling them that they are "pictures out of doors" but "wildcats in your kitchens" (2.1.110). That is, they act as though they are sweet in public, but in private they are argumentative and unruly. Iago adds that women act as though they are only being nice when they hurt others, but when others hurt them, they become "devils" and are hateful. Then, Iago adds, "You rise to play, and go to bed to work" (2.1.115). In other words, women are lax in matters of housework but shameless in bed.
While the purpose of Iago's accusations is not immediately apparent, his remarks about the women in this act foreshadow his later punishment of them. Iago's insults also reveal his duplicity; although on the surface they might seem teasing, there are serious overtones to his words.