Male fertility myths
"Infertility is usually the woman's problem." Male factor is involved in a substantial proportion of cases. A semen analysis is quick, inexpensive and non-invasive, and should be among the first tests — not a later one. Assessment of the male partner is still frequently delayed or skipped.
"If he can ejaculate normally, his fertility is fine." Semen volume and appearance tell you almost nothing about sperm count, motility or shape. Men with azoospermia have entirely normal-looking ejaculate.
"A low morphology percentage means serious infertility." Under strict criteria, a low proportion of normal forms is usual even in fertile men. No single semen parameter is highly predictive of fertility on its own — results carry weight when several are abnormal together.
"One abnormal semen analysis settles it." Parameters vary substantially between samples from the same man. An abnormal result should be repeated before conclusions are drawn.
"Testosterone will boost fertility." The opposite. Exogenous testosterone suppresses sperm production and can cause azoospermia. The AUA/ASRM guideline states testosterone monotherapy should not be prescribed to men interested in current or future fertility, and is not a treatment for male infertility.
"Supplements will fix it." A Cochrane review of 90 trials in over 10,000 subfertile men found a possible live birth benefit that disappeared when poor-quality studies were excluded. The authors rated the evidence very low certainty and called it inconclusive, and found insufficient evidence for any specific antioxidant or dose. Low risk and low cost, but not a treatment — and not a reason to delay assessment.
"Azoospermia means no chance of biological children." Extended search of the centrifuged sample finds rare sperm in up to 35% of men previously thought azoospermic. Where none are found, surgical retrieval succeeds in many men, and retrieved sperm can be used with ICSI. Genetic testing determines whether retrieval is worth attempting.
"A varicocele always needs fixing." Repair should be considered where a varicocele is palpable and semen parameters are abnormal and the couple is infertile. Repair is not recommended for non-palpable varicoceles found only on imaging — the guideline grades that a strong recommendation against.
"Changes will show up next month." Sperm production takes roughly 72 to 90 days. Allow three months before repeating a test.
"Tight underwear is a major cause." Weak evidence. Sustained heat exposure from hot tubs, saunas and prolonged laptop use on the lap has better support. Focus there.
Sources
- AUA/ASRM — Diagnosis and treatment of infertility in men (2021)
- Cochrane — Antioxidants for male subfertility (2022)
Frequently Asked Questions
Do boxers really increase sperm count?▾
Modestly yes — a well-designed Harvard study found men wearing boxers had 25% higher sperm concentration than those in tight underwear. The mechanism is lower scrotal temperature. The effect is real but modest — it removes one contributing factor and will not cure oligospermia from other causes. Switching to loose cotton boxers during fertility treatment is a sensible low-effort change.
Does cycling affect male fertility?▾
Recreational cycling (under 5 hours/week) does not significantly affect sperm quality in most studies. Intensive endurance cycling (over 5–8 hours/week) is associated with elevated scrotal temperature and modest quality reductions. If you cycle heavily during fertility treatment, padded shorts and an ergonomic saddle reduce pressure. Casual cycling should not be stopped for fertility reasons.
Can a previous healthy child mean your sperm is still fine?▾
No — male fertility can change significantly over time. Weight gain, ageing, varicocele development, new medications, testosterone or steroid use, and new infections can all substantially impair sperm quality that was normal years earlier. A new semen analysis is always needed — do not assume past results are still valid.