Men can urinate standing up whereas women cannot. This gives them the ability to urinate more quickly and in turn get more work done.
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Well I don't know enough about the statistics to have an informed opinion on whether or not a wage gap exists between men and women, but if one does exist, I would speculate that perhaps it exists simply because men have been in the workforce longer and therefore have the seniority promotions advantage over their newer female counterparts, in which case, I wouldn't necessarily say this is the result of sexism.