Metrosexuals Come Out By WARREN ST. JOHN By his own admission, 30-year-old Karru Martinson is not what you'd call a manly man. He uses a $40 face cream, wears Bruno Magli shoes and custom-tailored shirts. His hair is always just so, thanks to three brands of shampoo and the precise application of three hair grooming products: Textureline Smoothing Serum, got2b styling glue and Suave Rave hairspray. Mr. Martinson likes wine bars and enjoys shopping with his gal pals, who have come to trust his eye for color, his knack for seeing when a bag clashes with an outfit, and his...