Testify.
Everyone knows the sex stops after marriage.
Considering that even the corner grocery store must tell you when what you bring home is going to expire, maybe men should start asking just when their wives plan to start smelling bad, growing mold and becoming a hazard to a man's health.
Maybe an exchange policy is in order, where you could take her back for another one (or your money back) if upon first opening the package, you discover that she has already gone sour?