Planning the sex of the child on the day of ovulation
This is a modern method that has a scientific base, that is, it is proved by scientists.
Spermatozoa with “male” Y-chromosome live less than spermatozoa-girls, but they are more active in motion. Thus, in order to be born a boy, sexual intercourse should be on the day of ovulation. If sexual intercourse is earlier, then the «male» sperm will already die, and only «girls» will run to the egg.