This is a great question and it goes to the heart of cuckolding. A major part of cuckolding to me is the frustration and humiliation of watching the wife enjoy and react to a man in a way that I wished she did for me. I want to be the stud but can’t, and it naturally makes me jealous to see someone else in that role.
We think it is hotter if I don’t like the bull. She sees my angst and dread when I learn that certain guys are coming over, and she tries to soothe and reassure me. However, it always ends with her extracting my commitment to submitting to her decisions. It is particularly erotic when she gets me to agree to cleaning the cum and licking his cock clean if directed. She checks to see if I am hard despite pleading with her, and I always am.