Masculine = go towards, go forth and conquer, expansive, risk taking, maximise gains, offend
Feminine = draw in, preserve what there is, protective, responsible, minimise loss, defend
This representation is probably a common one. Astrology uses it, in that the extroverted and introverted elements are made to correspond to the masculine and feminine. In any individual, and in any group of individuals on any level, both sides must be balanced.