i've actually read that on Fertility Friend....
They say that the "girl" sperms are slower swimmers and better at getting through the more acidic CM.... So best to BD before O is due....
Whereas the "boy" sperms are faster swimmers, but die easily in acidic CM... so have sex near to Ovulation and in a position that leaves the spermies near to the cervix (doggy style etc)
It does say on there that its not proven but worth a shot! :wink:
i read that on the internet too was gonna try it but in reality you get what your given as i have had two boys and really desperate for a baby girl but have fun trying anyway good luck xxxxxxx