The most important thing is that if you are a 14 year old boy and you masturbate, you will not have any adverse effects on your body or on your fertility in the future. But if you masturbate excessively for a long time, it may have some impact on fertility. First, excessive masturbation, if the technique and strength is improper, is likely to lead to injuries to the reproductive organs; second, excessive masturbation, is likely to cause sexual dysfunction, such as erectile dysfunction, premature ejaculation, ejaculation disorder, etc. Finally, 14 years old is still in the adolescent development, excessive masturbation will affect the normal development of the genitourinary system, triggering stunted growth. Therefore, 14-year-old children occasionally masturbate once in a while is no matter, but do not often masturbate, usually also pay attention to regular rest and rest, more physical exercise to enhance physical fitness.