Benjamin,
I would say that regardless of the particular points under discussion, the general exegetical framework of allegorism is what most people would have a problem with.
If an overtly erotic marriage book is deemed to be too dirty and must be sanitized into something about Christ and the Church, what does that say about our view of conjugal union? Thus, the basic problem I would have is that the allegorization of SofS is contrary to the hearty puritan hermeneutic as well as the vigorous doctrine of creation and marriage.
I am unfamiliar with a specific book on the topic.
Cheers,
Adam B., Wine Country, California, PCA
Whisky may not cure the common cold, but it fails more agreeably than most other things.
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