That u mean .. girls are enemy to itself??
Gary Brase, working at the University of Sunderland, UK, looked at jealousy in many countries and found the expected differences between men and women.
It reveals that Brazilian men are the most jealous; Swedish men and women are more concerned about sex than any other nation, and Japan is the least jealous country.
They also maintain that the origin of jealousy in women is due to the substantial investment they make in time and energy in producing a child. They do not want it to be wasted if their partner falls in love with someone else.
Countries with high fertility rates, like Brazil, had men who ...more