CANDACE BUSHNELL'S PORN PAGES Sex and the city writer CANDACE BUSHNELL is contributing to a raunchy anthology of literary erotica - and will maintain her mystique by using her "porn-star" name. Bushnell joins an illustrious list of authors, including KATHY LETTE and FAY WELDON, to create IN BED WITH - but their anonymity remains intact thanks to their saucy pseudonyms. A source explains, "They'll be using their porn-star names - that's first pet, plus childhood street name. "Not even their agents know who's who."