To the OP.
Marital love is supposed to have sexuality. Even in the NT it encourages married couples to come together regularly. This man is in love with her inside and out, and her in love with him the same way. I see nothing graphic or pornographic in this book. Just because your personal interpretation makes you see it that way doesn't mean it Is that way. I'd say, if anything, your opinion, and over the top reaction, reflects more on you than it does the bible.
I only hope if I get married one day I can feel even half as strongly about my wife as they speak about on another.