'I'll warrant him for drowning; though the ship were no stronger than a nutshell, and as leaky as an unstanch'd wench': The Tempest, I i 45–47: leaking as much as a girl that, during menstruation, wears no sanitary pad (or towel or clout), stanch being 'to check the flow of (particularly, blood)'; or, perhaps, rather, it = as much as a girl whose menstrual flow has not ceased.
ERIC PARTRIDGE (2007-04-16). Shakespeare's Bawdy (Routledge Classics) (p. 171). Taylor & Francis. Kindle Edition.
Let me know if you have found worse