How long have you daydreamed of her getting seduced my a stranger and watching her walk away hand in hand with this Casanova?
How did you talk to her about the you giving her the freedom to fuck any man she picked? What was her words when you brought up the subject?
Did you tell her it was your fantasy or did you tell her you noticed how other men have been looking at her with lust? Two different ways of introducing the idea in her head.