BW it's not just pilots - aircrew, airfield technician type people, apparenlty it has something to do with the radar equipment used.
It also said about the boy in the Navy has everything to do with the radar, XH little swimmer arent in the best shape due to this, but that said we have 2 off each lol... they also say that if your man has been away along time then your more likely to get a boy and if he is home all the time you get girls, we concived DS1 after xh was away for 4 mths