2) Change the pH of vagina: Washing vagina with 2%-2.5% soda water before having sex can increase the chances of having a boy.
3) Mastering the ovulation period: By measuring the basal body temperature, mastering the ovulation time, it is generally easy to have boys in the same room near the ovulation time.
4) Control the number of sexual intercourse: If the number of sexual intercourse is not much, the amount of sperm ejaculated each time will be more, and the chances of having a boy will be greater.
5) Grasp the time and depth of ejaculation: If the man ejaculates when the woman reaches orgasm and at the same time ejaculates around the woman's cervix, it is easy to get a boy.