Avenue Q — the witty updating of Sesame Street for the 20-something set — contends that, dammit, puppets are people, too. Thus, it boldly goes where PBS fears to tread, including gay puppets, fetishistic puppets, slutty puppets, and racist puppets, all set to a bouncy, infectious score. One of the show’s catchiest numbers — “The Internet is for Porn” — boasts a truism as profound as anything in Heidegger.

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