I've always read the opposite. Low porosity is has difficulty absorbing and giving up moisture, high porosity absorbs and gives up moisture easily.
I have low porosity hair, and unfortunately not much of it thanks to age, thyroid and medication I take. My hair is chin length bob. I wet, use a rinse out and style every day. Wrap in Curlease towel while I dress, etc., use a CLU to scrunch out the water and diffuse for 5 minutes with a professional dryer. It still takes my hair several hours to dry. When I worked (and before I used products), it would still be damp 5 hours later without the curl towels.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me