These people don't know what they're talking about. Just collect pollen from the female flowers and then put it on the male flowers and you'll get half female and half male seeds. The breeders who make feminized seeds collect pollen from female flowers all of the time, that is how they make the feminized seeds. If you collect some female pollen be sure to let it sit in the crisper tray in your refrigerator for a couple of days to age and then you can spray it onto the male flowers with a blow dryer or whipped cream dispenser. Good luck bro