The old headline blamed “Wi-Fi laptops” for male infertility. The science does not support that simple conclusion.
There are really two questions hiding inside it: does a warm laptop placed directly over the lap raise scrotal temperature, and does wireless radiofrequency exposure from laptops meaningfully reduce human fertility? The evidence is much clearer for the first than the second.
A laptop on the lap can raise scrotal temperature
A controlled study of 29 healthy volunteers found significant increases in scrotal temperature during laptop use. Part of the increase came from the sitting posture with the thighs together; the operating laptop added further heat. Later reviews continue to identify testicular hyperthermia as the most plausible laptop-related fertility concern.
Much less certain
Limited and inconsistent
Reviews include human, animal and laboratory studies with different exposure methods and endpoints.
Some report sperm changes
In-vitro experiments can show biological effects under controlled exposures, but they do not automatically reproduce real-world human exposure.
Not a clean signal
An older meta-analysis found no adverse semen-parameter effect in pooled human studies while laboratory and animal findings were more concerning.
Do not turn uncertainty into certainty
The evidence does not justify saying normal laptop Wi-Fi exposure is a proven cause of male infertility.
Move the hot computer off the lap
If someone is concerned about fertility, placing a laptop on a desk or stand is a simple way to reduce direct heat exposure without making claims about radiofrequency radiation. A 2026 review of scrotal thermoregulation notes that avoiding excessive scrotal heat can be considered as a general measure while emphasizing that individual lifestyle factors rarely determine fertility on their own.
Fertility problems deserve a real evaluation
WHO’s 2025 infertility guideline covers evidence-based evaluation and treatment of male-factor infertility. If a couple has difficulty conceiving, the answer is not to focus on one device exposure while ignoring semen analysis, medical history, medications, varicocele, hormones and partner factors.
The laptop headline needs one word removed: certainty
Direct laptop heat can raise scrotal temperature. That is a measurable effect.
Normal Wi-Fi exposure being a proven cause of male infertility is a much stronger claim, and current evidence does not establish it.