A woman prefers a more masculine man when she is fertile and looking for a fling rather than a mate for life, according to a new study. I however prefer a manly man all the time, fertile or not! But the finding are fascinating and show that even in today's society our animal instincts still win out sometimes. The finding suggests the value that women place on masculinity changes with context and with women's reproductive cycles and immediate goals. A woman's preference for manly men also was found to vary based on how attractive she rated herself. And some of a woman's sex drive might involve tricks in the brain over which she has no control. Previous research has shown that women view facial masculinity--square jaws and well-defined brow ridges--as good characteristics for short-term partners, while more feminine traits are perceived as better for long-term mates. Another study found that women smell better to men at certain points in their menstrual cycles. A