I'm going to have sex with a buddy's ex wife
Why are you going to try to hurt your buddy in such a way?
I've always felt she was hot.
Your friend would be hurt by you sleeping with his ex-wife. This is not proper behaviour. Find someone else to sleep with or lose your friendship.
I don't care. I trust my buddy will still be a friend.
I think that you should reconsider what you are about to do. You shouldn't sleep with your friend's ex wife.