Aside from the obvious, jealously, not why I got married, etc. I don't see why hubby's
Never mind trying to understand it. It should suffice to know there are deviant pleasures associated with certain hubbys seeing it. These pleasures are for you too if you allow yourself enough leeway to acknowledge it is a great joy to ravage a man's wife, especially if he allows it.
It is an outside of the box kind of thinking both hubbys and wives have discovered and it up to you to revel in it as well, take the utmost delight in it, as opposed to trying to question anything about it. You just lay pipe, daddy, and enjoy it. A good hotwife and cuck will appreciate that.