Метод
Dr. Landrum Shettles proposed that Y-sperm (male) are faster but shorter-lived, while X-sperm (female) are slower but more resilient.
- Мальчик: Близко к овуляции.
- Девочка: За 2-4 дня.
Метод Шеттлза.
Dr. Landrum Shettles proposed that Y-sperm (male) are faster but shorter-lived, while X-sperm (female) are slower but more resilient.