Original sentence: A classic example of a gender gap is the difference in pay between men and women for the same job responsibilities.Though some gender gaps are controversial, it is not to be confused with sexist stereotypes.Women live longer than men in most countries (a notable exception is Afghanistan)
Edited sentence: A gender gap favoring the male sex is called a pro-male gender gap, while the opposite is called a pro-female gender gap.Female students are believed to be better in literature.Gender gap inversion is possible, since the male life expectancy increases slightly faster than the female life expectancy.Life expectancy also has a racial gap, favoring the Asian and Caucasian races.Male students are believed to be better in mathematics.Males are much less likely to violate certain dress codes, especially in high schools and workforce training centers.Many people, however, are offended by gender gaps that favor the opposite sex.Men are believed to be better doing some things, and women are believed to be better in other things.Men are believed to be better in politics and governing a country, or that patriarchy is believed to be better than matriarchy.Most notable exception is Afghanistan.There are more women working traditionally male jobs than vice versa.This gender gap is possibly subject to gender gap inversion.This is particularly evident in the "gap" that "Female students are believed to be better in literature", however, in older times, a lot of quality literature was produced by men, and was the exclusive domain of men.While some of the qualities that characterize gender gaps may be biological, it can be argued that some of these qualities have a founding in sociological treatment of the  genders, such as gender norms, and  gender roles, and thus these gaps are not "established facts".Women live longer than men in most countries