Be sure to read this article in it's entirety, it's well worth it......I'll just be posting a portion here.
Without further ado.....the truth behind the wage gap,
Men go into technology and hard sciences more than women.
Men are more likely to take hazardous jobs than women, and such jobs pay more than cushier and safer jobs.
Men are more willing to expose themselves to inclement weather at work, and are compensated for it ("compensating differences" in the language of economics).
Men tend to take more stressful jobs that are not "nine-to-five."
Many women prefer personal fulfillment at work (child care professional, for example) to higher pay.
Men are bigger risk takers than women, in general. Higher risk leads to higher reward.
The worst working hours pay more, and men are more likely to work these hours than women.
Dangerous jobs (coal mining) pay more and are more male dominated.
Men tend to "update" their work qualifications more than women do.
Men are more likely to work longer hours, and the pay gap widens for every hour past 40 per week.
Women are more likely to have "gaps" in their careers, primarily because of child rearing and child care. Less experience means lower pay.
Women are nine times more likely than men to drop out of work for "family reasons." Less seniority leads to lower pay.
Men work more weeks per year than women.
Men have half the absenteeism rate of women.
Men are more willing to commute long distances to work.
Men are more willing to relocate to undesirable locations for higher-paying jobs.
Men are more willing to take jobs that require extensive travel.
In the corporate world men are more likely to choose higher-paying fields such as finance and sales, whereas women are more prevalent in lower-paying fields such as human resources and public relations.
When men and women have the same job title, male responsibilities tend to be greater.
Men are more likely to work by commission; women are more likely to seek job security. The former has more earning potential.
Women place greater value on flexibility, a humane work environment, and having time for children and family than men do.