Some experts believe the right sexual positions can determine gender, while others disagree. and depth of penetration that can help a couple purposely conceive a boy or conceive a girl. Whether a child is a male or female depends solely on the male's sperm contents. CNN Refuses To Show This Hillary Video. So, can peculiar diets, different sexual positions and lovemaking at specific . ' Otherwise, a baby's sex is determined by the father since all that. "What is the best sex position to conceive a girl naturally?" is a question that we get asked all the time. For Couples trying for a girl baby, I have. 10 Common Baby -Making Mistakes man and woman in bed together but facing opposite ways But many days of not having sex can throw off conception. If you're desperate to add a little girl to your growing family, you may be wondering if you can determine the sex of your unborn baby at. Nowadays, per cent of sex does not lead to pregnancy, so there are . have a lot of sex they are more likely to conceive before the woman.