Women are often smarter than us. Women are usually stronger emotionally. A woman is a human being first and a woman second. Remember that women don't think all the time about the fact that they are women any more than men think constantly about being men. The self-conscious reference to gender and physical differences is what ruins most authors when they attempt to write the voice of the opposite sex.
Women tend to be more interested in other people than men are.
Women often think in terms of relationships where men often think in terms of their own gain or loss. Women do not all have maternal instincts but they do tend to feel the most for people who are downtrodden or hurt or small or alone. Women tend to respond well to honesty from a man, to sincerity from a man and to simple romantic things. Remember that in any conversation in a book between a man and a woman it is likely a woman will talk about feelings and a man will talk about himself. Like any guy, I have loved my share of women.