Hidden Reasons Men Act the Way They Do - "The fact is, he is a man, and many of the hurtful and calloused actions you have witnessed are simply the result of his nature as a man."
Mental/emotional differences:
"Women tend to be a more 'personal' than men. Women have a deeper interest in people and feelings, while men tend to be more preoccupied with practicalities that can be understood through logical deduction."
Physical differences:
"Men and women differ in every cell of their bodies. This difference in the chromosome combination is the basic cause of development into male or female as the case may be." Some of these physical differences: Women's basal metabolism is normally lower than men's. Women's thyroid gland is larger and more active. In brute strength, men are 50 percent above women.
Sexual differences:
"Women's sexual drive tend's to be related to their menstrual cycles, while men's drive is fairly constant. Women are stimulated more by touch and romantic words. They are far more attracted by a man's personality, while men are stimulated by sight."
Intuitive differences:
"What exactly is this 'woman's intuition'?" It's not something mystical; rather, it is an unconscious perception of minute details which are sometimes tangible, sometimes abstract in nature. Since it is usually an 'unconscious' process, many times a woman isn't able to give specific explanations for the way she feels. She simply perceives or 'feels' something about a situation or person, while a man tends to follow a logical analysis of circumstances or people."
Excerpts from chapter 3 of For Better or For Best: A Valuable Guide to Knowing, Understanding, and Loving Your Husband by Gary Smalley