Mumps infections contracted before puberty generally do not lead to male infertility. However, mumps occurring after puberty, especially when it affects the testicles, can cause serious fertility problems. Early diagnosis and preventative measures can mitigate these risks. Therefore, mumps vaccination is of great importance. High-fever infections such as chickenpox, measles, and rubella, particularly when experienced post-puberty, can variously impair sperm structure within the testicles, negatively affecting sperm quality and potentially leading to infertility.