Hmm, polyamory. There can be different reasons why a woman would want to be with more than one person. Some women believe in polyamory - that it is possible to love or be intimate with multiple partners at a given time. While I believe that people are different, I have never met a women for whom this relationship is easy, even if it is her preferred way of approaching romantic relationships. A woman can also just be attracted to many different people, and this lead to wanting to move from relationship to relationship and occasionally sometimes cheat on her partner.

From experience with friends I've often seen that it is hard for partners of polyamorous women (and men too!) if they are not comfortable with this type of behavoir. I personally have a very monogamous sensibity, it would be hard for me to watch a lover approach a relationship so differently.