How has photography and micro filming influenced genealogy?

In ancient times (before digital Photography) it took so long to take a photograph that people weren't able to procreate - often they had to sit perfectly still for several days while a photograph was taken. It was a commonly accepted 'rule of thumb' that the more photos one had taken, the fewer children one was likely to have. Also, the chemicals used in early flash photography and photographic processing (development) are now known to cause sterility and incredulity in poseurs.