Men’s sperm swim faster and more likely to die than female sperm. So sex in the next 2 to 3 days before When ovulation may have a daughter and have sex on the day of ovulation may have a son.
After World War II, when The soldiers returned the number of sons increased. One explanation suggests that couples who have come together and have more sex than usual chance of sperm near the day of ovulation was increased.
But the risk is that if you set the timing of intercourse, through the day of ovulation, you may lose the opportunity of pregnancy, most couples will not be able to determine the degree of accuracy through the day of ovulation. – See more at: