And nothing can or shall content my soul
Till I am even’d with him, wife for wife,
Or failing so, yet that I put the Moor
At least into a jealousy so strong
That judgment cannot cure.
– William Shakespeare
Othello, Act 2, Scene 1. Iago vows revenge on Othello and believes that the way to do this is through Desdemona. Suspecting that Othello has slept with Emilia, he demands "wife for wife." This suggests that Iago is thinking of revenge sex with Desdemona, or getting another man to sleep with her. Failing that, he will drive Othello to such a fit of jealousy that nothing will cure it. Ruled by sexual jealousy, Iago is a prime example of toxic masculinity.