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How a positively charged insulating rod can be used to give a metal sphere a negative charge?

how about a positive charge? And can that same rod be used to simultaneously give one sphere a positive charge and another sphere a negative charge without the rod having to be recharged.

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1. Take two isolated metal spheres and bring them together. Now bring the rod near one of them. It will attract electrons to that side of the sphere (making it have a net negative charge), leaving an absence of electrons on the other sphere(making it have a net positive charge), Now separate the spheres. Remove the rod and you have two charged spheres, one positive and the other negative