re: Can any employer here please tell me how to hire a women for less than a man?

As a woman I would say that childbirth and staying out of the workforce for periods of time, are the biggest reasons women are not on par in pay. So while a lot of them start at the same pay, those absences held them back.

And if they are single moms, it's harder to work OT.

Also, although it's much rarer these days, working married mothers were the ones that were usually expected to take off when the child was sick. Lots of women got tired of the hassle both at home and work, and just gave up, which took a lot of them out of the market for longer periods of time, or completely.