I discovered this very early in life and have used it to advantage throughout the years. Most men have no clue how powerfully women are turned on by watching 2 men have anal sex. In many of my encounters, the female wanted to get watch the action close up. Some would suck the bottom as he got fucked but the majority just seemed to want to look at the actual penetration from just inches away.
I strongly feel that, once the cuck starts to like sucking and being fucked himself, he should be penectomized AND given hormone shots so that his sole purpose in life is now his Bull’s (and secondarily, his wife’s) pleasure. If they want him able to directly enjoy the sex, he would still have his prostate, which can be pounded by a real ManHood or by the woman’s strap-on.