Everyday Habits, Backed by Research

Research-backed notes on the everyday habits that keep showing up in reproductive health research - heat, sleep, and more. No hype, just the studies and what they actually found.

Heat, Warmth, and Sperm Quality

What sauna, hot tub, and laptop-heat studies actually found - and why the effects are largely reversible.

Sleep Quality and Sperm Motility

A 970-person study on sleep and semen parameters - and what it did, and didn’t, find.

The Sperm Count Decline Debate, Explained

Two major studies on falling sperm counts reach different conclusions - here’s where they actually agree, and what it means for motility specifically.

Microplastics and Sperm Quality

What’s actually been detected in human reproductive tissue, what it’s linked to, and where the public conversation gets ahead of the research.

Smoking and Sperm Quality

How smoking compares to non-smoking in sperm concentration studies, and why it’s one of the more directly modifiable factors.

Weight, Exercise, and Sperm Quality

What body weight and exercise studies found - and why consistency, not intensity, is the throughline in both.

Common Sperm Myths, Fact-Checked

Two of the most repeated sperm claims, checked against the actual research - one doesn’t hold up, one is more real than its reputation suggests.