There used to be a ppruner called "Whirlycopter" and I THINK (only think, mind) that he was a chap.
However, when I picked my username, I did so with no reference to the Whirlygirls organisation ('cos I'd never heard of them at that time) but purely because it is the name of a traditional English tune (Playford for those who care) with a heli connatation and ,as a musician, it seemed appropriate.
...as for the calender.... if it's going to be as tasteful as the East Anglian Air Ambulance (black & white v. sexy) and the others are game then baggsy I'll be Miss January. Can't say fairer than that eh boys?
Cheers
Whirlygig