Right, which is a reason why women get paid less. Lots of women never get pregnant, but lots of them do, and they are free to do so. But the employer is also free to respond accordingly when their bottom line is affected. If a company is constantly having to train new people because the prior ones bailed and never came back (via a way that is illegal to prevent against like you could with a Noncompete for someone simply changing jobs), then that has a legitimate effect on the company's resources, and they can adjust salaries accordingly. If their #analytics and #advancedstats show that 40% of their female employees will leave to have a kid and then not come back for 2 years (if ever) such that they have to incur the downtime to train someone else who may end up doing the same thing and perpetuate the cycle, then why shouldn't they be able to factor those resources into their payscale?