Dan, the way to date all the girls in the universe is simple:
All you have to do... is FAIL to give a shit about any of them. As we all know, women are irresistibly drawn to a man who ignores and neglects them while avoiding those who genuinely care. At some point, you simply reverse your course of action and accept them all. Before jealousy and backstabbing take over and make an unliveable mess of the situation, you will (for at least 0.034278 +/- 0.000001 seconds) have simultaneously dated every woman alive.
(don't hate me, ladies. It's been hard times lately....)