71.  If men and women all play exactly the same role, the efficiency might be lower.

72.  If a girl can do labor work better than men, there's no reason to force her sitting in the office idly; on the other hand, if a man loves taking care of children and cleaning up, he might be a good "house-husband".

73.  For instance, if men and women feel that they do not fit the roles of gender, people will raise doubt about their sex orientation.

74.  We cannot confirm this inference from the perspective of physics, but if we pay more attention to the characteristics of men and women, we could interpret it better in a reasonable way.

75.  However, men may become reckless if they are too brave and become stubborn if they are too unyielding.

76.  Similarly, women may get fragile if they are too delicate and get irresolute and hesitant if they are too thoughtful.

77.  If a person only has the typical characteristics of men or women, he or she must be isolated and uncompleted because a perfect one would try to cultivate all the brilliant characteristics belonging to the entire human beings.

78.  Women could do some heavy and dangerous labor work or play the role of a stateswoman like Mrs. Thatcher if they are interested in those jobs.

79.  If God really existed, I would ask him, with all due respect, why do you create two genders and even one gender has a big edge over the other?

80.  If we do not clarify the so-called differences, we may easily fall into the trap of sex discrimination.