Porn premiered last summer at the MAC to packed houses and, ah, a less than ecstatic review from our theater critic. But tastes differ. We liked it. And we're not the only ones. Porn's running this fall at Art Centre Theatre in Plano. The show's a great one for a date, preferably a first, as was our case when we saw it. A 70-minute exploration of all that is different between men and women who have sex on their minds, Porn for Puritans is funny enough to have a man slapping his knee--and his date's. This is crucial, this accidental touch. It loosens both parties' nerves. And because the play deals with sex, viewers will inevitably talk about it afterward (the show, that is...and, well, yes, by extension, sex.) There is no better topic to discuss on a first date--particularly if it goes well.