From a reader:

Jonah,
I’ve wondered the same as SAOTWTBDAWHNGMITFP guy. Also wondered about
states with common law statutes. Not a lawyer, but isn’t it true that if
two people live together for the statutory period, the law considers them
married. Am I correct?
If the state then considers them married can one party then sue the other
for alimony should the living arrangement cease. Maybe this is a question
for Levin. Just curious.