Minx

To dream of a promiscuous women, known as a minx means that you are trying too hard in life.  
Based on Freud, such dreams are inspired by sexual frustration or anxiety, but many dream experts think that they originate from deep-sitting feelings of inadequacy or frustration in most regions of your waking existence, not only the sexual.   Another  factor  to  consider is whether or not the frustration within the dream was 'because' of something. Quite simply, maybe this women is someone you know.