I always thought it was about a man who is involved with a woman that has serious sexual issues, and he's trying to stay with her, but she can't stay with him. At first, she's a conquest, a sample for his album. Then he starts falling for her, and she finally relents and they do it, but "these seconds when I'm shaking leave me shuddering for days". Then he starts to fall for her, and she can't commit.
But what the heck do I know?