Hi April
Yeh I agree, its hard to believe that a simple desire for a girl could influence the gender of the infant in the womb. However we don't know what influences that desire, could there be other biological influences at work who knows, we may never know.
Me for one, well I was brought up to be a boy in every sense of the word, toy machine guns, cars, "beer". I got caught by my dad once wearing my mothers underwear... OMG I got into some bother for that.