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Environmental factors and testosterone

Some researchers point to rising BMI and lifestyle or environmental factors as partial drivers of the decline in men's testosterone levels.

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Jan 17, 2026
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What role do masturbation and partnered sex play in testosterone levels and hormone balance after 50?

Masturbation and partnered sex produce short-lived hormonal shifts—testosterone often spikes around arousal or ejaculation and typically returns to baseline within minutes to hours—while they do not a...

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...