I'm so glad the doctor was there to point out that Shettles is not correct! That IS progress! The producers have tons of control in what callers get through and there may have been many people who did call and weren't let onto the air.
I have found that several of these families that "haven't had boy/girl in X number of years" are omitting several branches of their family tree or have all only had a teeny handful of kiddos! It's biologically very very unlikely that gender runs in families.
http://genderdreaming.com/forum/gend...make-boys.html