Epstein and Envelopes

I don't necessarily agree with everything Joseph Epstein writes in this piece about the recent dust-up in the human sexuality course at Northwestern, but I've always admired Epstein's writing. I particularly like this tart little sentence, in which Epstein refreshes a contemporary cliche:

A man with a penchant for smashing taboos, Professor Bailey enjoys pushing the envelope, but, like many another radical academic, prefers not to pay the postage.