This website argues against Christian erotica. He does as good of a job as can be done – meaning he does very poorly, indeed.
His argument is that “sex should only be shared between a husband and a wife.” The author is being deceitful here. He gets you to agree to add this word “only” and it seems reasonable. He then interprets the word maximally and pretends that you have agreed to this maximal interpretation.
So he says that masturbation is wrong because it is not shared between a husband and a wife. Stories of a virgin Christian couple’s honeymoon night is just a “lesser” evil because it is not shared “only” between a husband and wife.
So he has made his own reducto ad absurdum here. Masturbation was not discovered suddenly during Woodstock in 1969. It has been around since Adam took his first shower underneath the garden’s waterfall. Yet, somehow, God never thought it was important enough to include it in his very specific lists of forbidden sexual activities. Similarly, the author forbids publication of a married couples sex stories, but finds excuses for why the Song of Solomon is somehow only “informative” and not erotic.
As a psychiatrist, I understand what this poor guy is doing. He has a strong delusion. A fixed, false belief that is not subject to the normal restrictions of logic and reasoning. “Being aroused without a wife is wrong.” He knows that he is often aroused by sexual thoughts. He is engaging in the defense mechanisms of isolation, intellectualization, rationalization and deflection/denial to keep himself from admitting his problem. Because he is only “informing” his readers about sexual sin, he can become aroused during this discussion without feeling guilty. He then goes and humps his wife while feeling holy.