Brain and libido

Seasonal affective disorder hormones: How to tell SAD from low testosterone in men

Dr. Susan Carter, MD: Endocrinologist & Longevity Expert

Dec 29, 2025 · 13 min read

SAD usually follows a repeatable fall-to-winter pattern and improves in spring, while low testosterone is more likely when symptoms are persistent, come with libido or erection changes, and are confirmed on repeat morning blood tests. If your symptoms do not cleanly follow the calendar, or they come with sexual or sleep changes, it is time ...

Does having sex increase testosterone? The truth about bedroom habits and hormone levels

Dr. Alexander Grant, MD, PhD: Urologist & Men's Health Advocate

Dec 23, 2025 · 11 min read

Sex can cause a brief, small testosterone rise, but it does not raise your long-term baseline testosterone. Any change is typically short-lived (often on the order of minutes) and varies by person and study design. The bigger picture is a bidirectional feedback loop. Testosterone supports libido and erectile function, while arousal can trigger a temporary ...

Does testosterone affect how long you last? The science of stamina

Dr. Alexander Grant, MD, PhD: Urologist & Men's Health Advocate

Dec 19, 2025 · 12 min read

Testosterone mainly supports libido and erectile function, but it does not directly increase Intravaginal Ejaculatory Latency Time (typically about 5 to 7 minutes) because ejaculation timing is largely a serotonin-mediated neurological reflex. Low testosterone can still make you feel like you are finishing “too fast” by destabilizing erections and creating a rush-to-finish pattern. Here is ...

What happens if we release sperm daily? What science says about testosterone, muscle, and men’s health

Dr. Alexander Grant, MD, PhD: Urologist & Men's Health Advocate

Dec 11, 2025 · 14 min read

For most healthy men, ejaculating daily is safe and does not meaningfully lower long-term testosterone or impair muscle gains. Frequent ejaculation is unlikely to wreck long-term health, but there are a few important exceptions you should know about. “For the average healthy man, ejaculating every day is more of a lifestyle choice than a medical ...

Semen retention meaning and the science behind the hype

Dr. Alexander Grant, MD, PhD: Urologist & Men's Health Advocate

Dec 05, 2025 · 13 min read

Semen retention is deliberately avoiding ejaculation for a period of time. Research suggests it does not produce a sustained testosterone boost. A 2001 study in World Journal of Urology found a modest rise around day 7 of abstinence that drifted back toward baseline despite continued retention. Here’s what the evidence says about how “holding semen” ...

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Seasonal affective disorder hormones: How to tell SAD from low testosterone in men

Does having sex increase testosterone? The truth about bedroom habits and hormone levels

Does testosterone affect how long you last? The science of stamina

What happens if we release sperm daily? What science says about testosterone, muscle, and men’s health

Semen retention meaning and the science behind the hype