I don't care what someone once said on the Internet. I've never once heard of a woman being described as going "Balls out", and if I did it would not sound right at all. I've never heard my mother use the phrase, even though it was apparently used in a nonsexual easy her entire life. Balls out, dicks out, rock out with your cock out, jam out with your clam out... If you wouldn't expect to hear it in a Sunday sermon, it just might mean something lurid.