Yeah, I've read that explanation before, and I'm not buying it. It's an erotic love poem, one of the most beautiful ever written, but a lot of people need to see it as something else simply because they're uncomfortable with anything so frankly sensual being in their bible. Those folks need to stop and think-- God created us as sexual beings. God likes sex-- after all, he invented it. ;)
Now something on the lighter side...
I sleep, but my heart waketh: it is the voice of my beloved that knocketh, saying, Open to me, my sister, my love, my dove, my undefiled: for my head is filled with dew, and my locks with the drops of the night.
I have put off my coat; how shall I put it on? I have washed my feet; how shall I defile them?
(5:2-3)
Translation: "Not tonight, dear... I have a headache."