Why Do Girls Throw Like Girls?

Amazing Fact (TM): I've been throwing right-handed for my whole life. Make me throw lefty and I throw like a girl. Something to do with an urgent need to get base runners out.

Another Amazing Fact (TM): If you play catch with an Aussie, notice their motion will be more overhanded than yours, if you are a Yank.

It's nurture not nature here. Go get a softball and try to fast pitch. I bet there's a girl nearby that could beat you.