With the recession (or a word that rhymes with it) doing a number on the economy like the Visigoths did to Rome, many former white-collar workers have been forced to work with their hands. Some, perhaps, quite literally. Sperm banks in other municipalities have reported a boom of men with time on their hands and a shortage of cash in their pockets lining up at the doors. You'd think that San Francisco -- which has shed a fair amount of skilled postions of late -- would be stocked with men