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Index/Topics/Sperm Count Decline

Sperm Count Decline

Global decline in sperm counts from the 1980s through 2013

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Jan 26, 2026
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ethnicity with the best sperm quality and worst

A plurality of clinical studies of men seen for fertility evaluation report that men of Asian descent tend to have higher s and total sperm counts compared with White men, while men of n or Black desc...

Jan 23, 2026

What evidence supports or challenges reported temporal increases in average erect penis length?

A large 2023 systematic review and meta‑analysis pooled data from 75 studies and roughly 55,000 men and reported in mean erect penile length — an increase of about 24% from 1992 to 2021 after adjustme...