Rough and surly, smooth and sultry, or quick and raw — however you like it, you’ll find it in Studs, 20 of the hottest and best-written man-to-man sex stories to appear in print this year. In “Underground Operator” two men on a nearly empty subway platform indulge in rough, anonymous sex that lets them momentarily forget the stifling summer heat. “Donuts to Demons” finds a self-described “rock-n-roll artfag” searching for a lover “as patient and gifted and generous as he advertised on Craigslist.”