Good question! It's a pleasant sensation for the bull, I'm sure, but possibly a bit awkward? On the other hand, a "bull" in this sense of the work might b e thinking that by sucking him, her hubby has completely surrendered his wife to him. And the wife may be thinking the same thing. The think all the cuck wannabees need to keep in mind is what my wife said to me after her BF had spent the night and left: "I'd love to have him fuck me every night, but I know he's fucking different women all the time, - that gives me pause and I can't give him all of my love and affection as it doesn't mean anything to him. Any woman has to know her "bull" (wife and I don't use that term as it demeans her and her lover) is not exclusive to her.