How do you solve a problem like smegma?

Ok � that�s not a particularly sexy title. I admit it. But it is a valid point when one writes historical fiction. Writing bed-scenes when your writhing couple didn�t own a bath or shower and wouldn't do for several hundred years could be a turn-off for the reader.These days we are all Germ Free Adolescents, washing our hair every day and brushing our teeth whilst wearing scented panty liners