What exactly did Rush Limbaugh apologize for?

I'm rereading the "Statement from Rush":

... I chose the wrong words in my analogy of the situation. I did not mean a personal attack on Ms. Fluke....

My choice of words was not the best, and in the attempt to be humorous, I created a national stir. I sincerely apologize to Ms. Fluke for the insulting word choices.

The apology is clearly for the "wrong words... choice of words... word choices."  That's very precise, stated 3 times. He does not apologize for the "analogy." What analogy? There is only one analogy that I can see, and that is the analogy of Sandra Fluke to a prostitute (because she, as he put it, thought "American citizens should pay for these social [i.e., sexual] activities").

So what are the words — plural: words — that he apologizes for using? There's "slut." That's one. What's the other? If it's "prostitute," then how can stand by the analogy?

By the way, the prostitute analogy is used all the time in politics. I think of P.J. O'Rourke's book "Parliament of Whores: A Lone Humorist Attempts to Explain the Entire U.S. Government." They're all prostitutes! Well, O'Rourke's word choice was "whores." I'm sure Limbaugh didn't mean to imply that he's sorry he used such nice words. Prostitute is positively stuffy compared to whore.

And as for "slut"... recently, women have been embracing the word slut.

I'm going to monitor the Rush Limbaugh show when it comes on in a couple hours. Wouldn't it be a kick in the teeth if he said that he only apologized for his word choice, the "wrong words" were "slut" and "prostitute," and the better word, the word he should have chosen, was: whore. And: They're all whores!

I did not mean a personal attack on Ms. Fluke.... I meant a personal attack on all the Democrats in Congress!