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Such odd subject matter ... what is the history behind the term "Spooners delight"?
"Spooners Delight" is the name J. Thomas gave to this series of postcards -- similar to Hallmark naming a line of greeting cards.
I believe the term "spooning" in the early 1900s referred to the display of affection between a couple, usually during their courtship. This would be consistent with the subject matter of the cards displayed and those at the link that wt1 has posted.