As one who has been in HR management for many years in ethnically diverse environments, I can tell you that no particular demographic has a monopoly on work ethic or absenteeism. There are marginal as well as exemplary employees in every segment of the workforce. Traditionally, women have been the nurturers, and as such, tend to miss more days from work. However, I know women who accomplish more in 4 hours of work than their male counterparts do in 8. Women tend to have better multitasking skills. I'm not male-bashing.
Unfortunately, even in 2007, biases are a reality. They tend to be more subtle due to legal ramifications, but racial and gender discrimination are alive and well in corporate America. As the old adage states... "there's more than one way to skin a cat," and believe me, many organizations have become quite adept at concealing biases. Studies have even exposed the practice of rejecting resumes solely on the basis of the candidates' first name (Brittany Thomas vs. Shaquita Thomas). Technology is available to screen just about anything your heart desires. Sad, but true.