Why do you think Ms. Atwood chose [Offred's] relationship with Luke to be one where he is initially married to someone else, and he is cheating on his wife with [Offred]? I understand the setup for their marriage to be considered "invalid" (since they don't believe in divorce), but why this initial affair? I assume it's some attempt to expose the irony of her role as Handmaid (where she is also with a married man)?