However it originated, the term "Admiral" has become similar in connotation to "the Wife" or "the Boss" (when referring to the wife) or for pilots "ATC" with all of the associated baggage - for some positive and loving, for others negative and resentful.
You might also be interested in this discussion on Cruiser's Forum about what it means to be called an Admiral.
If you haven't already seen it, the Women & Cruising site is an impressive free resource. Founded and run by women who are movers and shakers in the cruising world. They've each agreed to be interviewed for the IWAC project as well.
Their resources page contains a ton of information for cruisers of all genders. I recommend a look.