1.  They can step into realms which were taken over by men.

2.  They think women should not be tied down to the family, and men should take responsibility for housework and child care.

3.  Under the circumstances, humans focus more on mental works than physical works, which means that men will never take up the advantages of greater competitiveness in strength any more or the advantages will not be quite apparent compared with previous situations.

4.  The other one is that men are more capable than women so men take on the tougher responsibility.

5.  In this case, men take more burden of subsistence, as a result of which, men get higher status while women, weaker than men, cannot contribution too much.

6.  So, men take on the burden while women take care of the family; that's the tradition.

7.  Not only men take means like that, but mostly women do too.

8.  Secondarily, in modern life, women receive the same education as men and also are competent enough to fill positions which were always taken by men in the past.

9.  Women were responsible for gathering and men took hunting as their work.

10.  We hold the common view that men take heavy work, and they can stay up late to finish their task.