@Quinn phil,
I always thought of blue laws as laws regarding pornography. The concept appears to be broader than that. The prohibition on rape, however, does not seem to be a blue law but just a law.
A
blue law is a type of law, typically found in the
United States, designed to enforce religious standards, particularly the observance of Sunday as a day of worship or rest, and a restriction on
Sunday shopping. Most have been repealed, have been declared unconstitutional, or are simply unenforced, although prohibitions on the sale of
alcoholic beverages, and occasionally almost all commerce, on Sundays are still enforced in many areas. Blue laws often prohibit an activity only during certain hours and there are usually exceptions to the prohibition of commerce, like grocery and drug stores. In some places blue laws may be enforced due to religious principles, but others are retained as a matter of tradition or out of convenience.
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