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A useful example to consider is the case of James Tiptree, Jr, the pen name of Alice Sheldon. She wrote her stories (especially the earlier ones) from a male viewpoint, and the impersonation was so...
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A useful example to consider is the case of James Tiptree, Jr, the pen name of Alice Sheldon. She wrote her stories (especially the earlier ones) from a male viewpoint, and the impersonation was so successful that Robert Silverberg referred to the theory that Tiptree was a woman as "absurd", and no less an author than Ursula LeGuin refused a contribution to an anthology on the basis that contribution was restricted to women (this was in the relatively early days of feminism). Judgement of authorial gender is (or can be) an exceedingly tricky business. In large part, it requires playing to the preconceptions of the audience. Sometimes you can get away with putting your character into situations where "acting like a man" is the only way to survive. Soldiering/combat is probably the best example of this. The required characteristics - aggression, unflinching toughness and apparent disconnection from emotions are all survival traits under this sort of stress, so it's easier to accept this sort of behavior. Outside of these situations, you're in muddy waters. The best advice I can give is to read widely, observe people in everyday interactions (so far as they relate to your proposed story), and think very hard about what you've seen. In general (at least in our culture) women tend to be more passive, less overtly agressive, more socially active/involved, and more concerned with emotion/feelings than men. To do otherwise is to be accused of "acting like a man". And actually acting like a man will, in many circles, get a woman labelled a bitch. Of course, delineating these differences can be tricky, too. There is an underlying behavioral/emotional/sociological thread which, if violated, will make your writing ring false. Worse, this thread is not constant among all readers. Compare the behavior of most women nowadays with that recommended in the book "The Rules", which was very popular 20 years ago. Good luck.