Méthode Shettles
Dr. Landrum Shettles proposed that Y-sperm (male) are faster but shorter-lived, while X-sperm (female) are slower but more resilient.
- Pour un Garçon : Rapports proches de l'ovulation.
- Pour une Fille : Rapports 2-4 jours avant.
Basé sur la méthode Shettles.
Dr. Landrum Shettles proposed that Y-sperm (male) are faster but shorter-lived, while X-sperm (female) are slower but more resilient.