I also have very porous hair and I only avoid humectants when the it's very dry (the dewpoint is low) or when it's extremely high (like over 60 or 70). I'm also watching how much I use when it gets over 55 because I don't like my hair looking wet.
http://public.fotki.com/msgiblet/ - pw: gibber -- Pics Added 7/10/11
Fine, Thick, Normal Porosity, Normal Elasticity
Countess Balashi of Divi Beach in the Order of the Curly Crusaders
If I'm Going To Have A Bad Hair Day, It Might As Well Be In Aruba!