I disagree.
Let's face it, rejection sucks, and for many guys, rejection can be an emotionally painful experience.
One way you can reduce the amount of rejection is to get better at looking for signs that a woman might say yes. So when you actually do ask a girl out on a date, you have a higher chance of her saying yes. If you just ask women out no matter what signs they give, not only will you get rejected me, you'll probably get burned out faster as well.
So I would say before you ask a woman out on a date, look for signs or "choosing signals" that would indicate that she would actually say yes.