From what I know of it, it's more of an S&M / Power Exchange thing than a swinging thing. The people involved are often in a femdom relationship, where humiliation is part of that particular couple's kink. It's often combined with chastity play - the woman having sexual control of the man's release.
Seems mental to me, but it takes all sorts.
Cuckolding has to many different meaning and variations nowadays for anyone to be right or wrong to what cuckolding actually means. What your fantasy maybe about cuckolding could be nothing like what the so called “Bull” considers cuckolding is. After having a bad experience with cuckolding I would suggest you play an active role in planning and controlling any meets. It can and does go wrong sometimes when you invite another man into your family nest.
It can be fun if you all keep it under control and to plan but the minute one of the 3 sees it any other way make sure you can put a stop to it or the “Bull” will put a stop to your happiness.
I know you don't approve of cheating Tweeks. up to a point you can govern people's behaviour, but it crosses a line to think that thoughts and feelings can be scrutinised or even controlled?
One thing that has been mentioned but worth pointing out. WHat should people do if they like it too much?
I know there are fears and doubts etc, but the opposite is worth thinking about too ;o)