There is Greg, a blond stud of 19, flanked by Cowboy, an angular 21-year-old, and David, a lithe 22-year-old with deep-set, warm brown eyes. Three hustlers standing on the street before the steaming rush-hour traffic draw the heated gazes of male motorists cruising through the tenderloin district. A misty rain dampens the sidewalk in front of the Naples Cafe on New York Avenue NW near 13th Street.