Are helicopter pilots different?

[jab]

The theory I heard, of why helicopter pilots have more female kids, has something to do with stress. Not ours though, the wives waiting for our endangered butts. They are the ones who worry and this results in more female kids. There are a lot of references but I have enclosed one link below for those interested. Due to copyright laws I don't want to cut and paste onto this post.

Female births outnumber male in times of stress - Everybody - Health Information for New Zealanders