Taken from “No name woman” by Maxine Hong Kingston
Prodigal- noun
Definition: a person who spends, or has spent, his or her money or substance with wasteful extravagance; spendthrift.
http://dictionary.reference.com/browse/Prodigal?s=t
From page 1231: “leaving only the gravel, eating even the gizzard lining could such people engender a prodigal aunt ?”
After defining this word I know understand what the author was describing when she states “adultery is extravagance”. She compared this to having a aunt this is prodigal.