Unfulfilled Desires

I am married with my first baby on the way. Here is my dilemma.... I have always fantasized about having a girl on girl experience, or multiple girls. It turns me on to watch it and I want to know what it feels like. I feel bad for feeling this way because I absolutely love my husband. However, this is something I've desired since before we even started dating but never acted on (although I've had a couple of opportunities). My best friend told me I shouldn't feel bad for feeling this way because being a wife and a mom doesn't change the fact that I'm still a woman. It made me feel better about how I feel, but I'm still stuck. I don't know what to do. I want to fulfill this fantasy so bad....