Are there any wives that only have sex with other men to solely please their man?? Sure you get enjoyment and pleasure out of it but you ONLY do this to please your man and would rather only have sex with your man but he prefers to share you.
I agree they are common but should not be. Also, a lot of people don't realize until later in the marriage they want to open things up. Sometimes fantasies are just fantasies, then later become things you actually want to try. Sometimes new ideas, desires etc pop up.