Re: Not necessarily #2
No... it would likely compensate by seating the males (average weight for W&B calx = 83kg) and anyone who didn't care where they sat, forward of the CoG.
And a small correction to my original post:
"alter the Centre of Gravity to a point where the trim cannot bring it back to flyable limits"
..should really be:
"alter the Centre of Gravity to a point where the trim cannot bring the Centre of Lift (or Pressure) back to flyable limits"