And most bathrooms are small and often without a window.
Not a complaint, just pointing out that sun-drying is often not a real choice. Often it is.
A related thing often banned is external over-the-air antennas, protected by US federal law.
"The purpose of this Act is to prohibit real estate contracts, agreements, and rules from precluding or rendering ineffective the use of clotheslines on the premises of [b]single-family dwellings or townhouses[/b]." [0] http://www.capitol.hawaii.gov/session2009/bills/SB1338_CD1_....
One benefit of this is that your clothes last much longer.