NEAL Boulton has quit as editor of the gay magazine Genre to pursue his dream of becoming a best-selling author. Boulton recently sold his motorcycle-trekking book, “Sex Across America,” and is working on a memoir about being a married bisexual dad of two with a switch-hitting wife. “I made the hard call to leave my friends at Genre. It’s been a good run,” Boulton told us. “Hell, Anna Wintour had to close Men’s Vogue – we’re still standing.” He adds that his lifestyles Web site, BastardLife.com, has been “seriously approached” by “Penn & Teller: Bull[bleep]!” director Star Price about doing a show called “BastardLife NYC.”