Your friends are either lieing or severely misinformed. Testicles DO NOT drop during puberty. The testicles descend from the lower abdomen (where the ovaries are in females) into the scrotal sac usually during the last two months before, or very shortly after, birth. If a testicle doesn't descend completely, or at all (called an undescended testicle...an extremely imaginitive name), during this time period, then it will usually descend during the first year or life. If it does not, then surgery is usually used to bring the testicle down into the scrotum. Testicles left undescended for a long period often produce very small levels of sperm. That being said, your friends' testicles either did not recently descend or they recently underwent surgery to lower their sperm-less undescended nads.

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