The time for that is not yet. All the Masters take a male body in their last incarnation, and there are definite, energetic reasons why this should be so. A Master is a totally soul-infused personality. There is no such thing as gender ― male or female ― on the soul level. There is only polarity of energy, positive and negative polarities of one energy. The Masters have brought both of these into complete equilibrium, so, in a sense, they are neither men nor women. They take a male body for its energetic qualities. The relationship between spirit and matter on this planet at this time is such that they must anchor powerfully in the world the positive aspect of that energy, as a balance to the negative aspect as it expresses itself in matter. In about 350-400 years time, this will change. It is a gradual process, and that energy relationship between spirit and matter, as we term them, will change sufficiently to allow Masters to take female bodies too, which then they will.