Looks like there are a few different ways of sexing ferrets.  This one is
about 60% accurate 70% of the time.  While lying (laying?) on your back on
the couch, let the ferret walk over your body.  If the ferret licks your
eyelids, its a male.  If the ferret bites your big toe, its a female.  works
well in this household!
[Posted in FML issue 1344]