Why do some men like to see their wives & girlfriends have sex with other men?

I was looking at some "films" online and it looks like this is quite a common fantasy and that some guys actually do it. I can never imaging wanting to see my wife or girlfriend with another man, it just doesn't make biological sense. It also doesn't seem that women enjoy watching thier men with... show more I was looking at some "films" online and it looks like this is quite a common fantasy and that some guys actually do it. I can never imaging wanting to see my wife or girlfriend with another man, it just doesn't make biological sense. It also doesn't seem that women enjoy watching thier men with other women. What gives?
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