Igoocom, you need to go into the Profile Field in the CP and select No for Show on Members List. Not sure if that'll help, but give it a try anyway >_>
The hack is wonderful, but doesn't seem to work with Radio Buttons. I'll have a fiddle with the code later to see if I can get it to work, but for now, I've made my Gender field into a checkbox (Which does work) and set it so a member can only select one checkbox