yes, yes, YES! It seems that readers do, in fact, want to have sex every day of the year. Picking up where its outrageously successful predecessor, um, got off is ''Position of the Day Playbook,'' featuring 366 erotic couplings packed into one chunky, inspiring, and hilarious compendium. Following the publication of ''Position of the Day,'' Nerve was bombarded with reader comments: Do any of the positions work better with equipmentsay, a six-pack and a helmet? And, hey, do I still need to go to the gym if I'm regularly having sex upside down with my head on a chair and my feet wrapped around my lover's neck? Nerve has tried to address these concerns and others in this latest edition. A team of nimble, limber, and extremely attractive volunteers selflessly ventured to the laboratory for months of researchthe results of those experiments are now available for only $12.95! Each sexual position comes with an estimated caloric expenditure (for each person involved), a list of possible side effects (leg cramp, lawsuit), and equipment recommendations (hanging bar, stethoscope, cowboy hat). And no workbook, ahem, playbook, would be complete without a followup section for comments and rating boxes for the reader to fill out.Publisher's note: Should parties find themselves stuck in one of the positions, they are advised to contact 911 immediately and neither Chronicle Books nor Nerve directly.