While that's true for leopard geckos for example - the same doesn't hold true for ball pythons from what I've been told.
Aw shucks... Yeah I remembered last night what it was I was watching. It wasn't animal planet... it was "Dirty Jobs" and the dude that runs the show was helping an alligator farmer... and that is where I heard it from... apparently alligator eggs hatch more females with lower temps and more males with higher temps...
Oh well.
-Matt
http://www.elusivereptiles.com
Specializing in ball python morphs
1.0 Spider - Rising Sun
2.0 Pastel - Old Yeller, Gnarles
2.0 Normal - Sir Hiss, Gargamel
0.1 Normal 100% Het Albino - Chuckles
0.1 Albino - Starfire
0.1 Reduced Pattern / Banded (tiger) - Bertha
0.2 Normal - Thulsa doom, Azriel
0.1 Normal (blackback) - Evalynn
0.1 Oddball - Georgia