This will be the start of a conversation about how sexual and erotic empathy are essential to enjoying seeing your spouse getting off with another. It is almost the opposite of jealousy.
For instance, I believe I have a great deal of erotic empathy.. I am very aroused by watching my wife being taken by another man or woman, almost to the point where I loose interest in anything else. My spouse, on the other hand, is not interested in watching or being with me and another woman.
Why is there such a difference?