A male factor contributes in roughly half of couples having difficulty conceiving, either alone or alongside a female factor. Despite that, investigation often begins with the female partner and reaches the male one late.
There is a practical argument for changing that order: the initial male assessment is a single non-invasive test, it is quick, and it either rules out a major contributor or identifies one early.
When to get assessed
The usual guidance is to seek assessment after twelve months of regular unprotected intercourse without conception, or after six months if the female partner is over 35. Earlier assessment makes sense where there is a known risk factor — undescended testes in childhood, previous testicular surgery or trauma, chemotherapy or radiotherapy, known varicocele, or a history of certain infections.
Both partners should be assessed in parallel rather than in sequence. Investigating one and then the other doubles the timeline for no diagnostic benefit.
What the semen analysis measures
- Concentration — how many sperm per millilitre
- Total count — concentration multiplied by volume
- Motility — the proportion moving, and how well they move
- Morphology — the proportion with normal shape
- Volume, pH and viscosity — which can point to structural or glandular issues
Two things are worth knowing about the result. First, values fluctuate considerably between samples, so an abnormal result is usually repeated after several weeks rather than acted on immediately. Second, the reference values are population thresholds, not a pass mark — men with values below them do father children, and men above them sometimes struggle.
What genuinely affects sperm quality
Sperm take approximately three months to develop, which is the key to everything below: changes made now show up in results about a quarter of a year later, not next week.
- Smoking — reduces count, motility and DNA integrity. Cannabis is also associated with reduced count and motility
- Alcohol — heavy intake affects both sperm parameters and testosterone
- Obesity — associated with lower count and altered hormone profiles; weight loss improves parameters
- Heat — the testes sit outside the body for a reason. Frequent hot tubs and saunas, and prolonged laptop use on the lap, are worth reducing
- Anabolic steroids and testosterone therapy — this one is underappreciated. Exogenous testosterone suppresses the signal that drives sperm production and can reduce counts profoundly, sometimes to zero. It is a common and reversible cause, but recovery takes months
- Certain medications — some for hair loss, blood pressure, mood and inflammatory bowel disease can affect sperm. Never stop a prescribed medication on your own; ask whether an alternative exists
- Occupational exposures — pesticides, solvents, heavy metals, and prolonged heat exposure at work
- Varicocele — dilated veins in the scrotum, one of the more common correctable causes
What is oversold
The male fertility supplement market is large and the evidence is thin. Some antioxidants show modest effects on sperm parameters in trials, but improvement in a laboratory measure is not the same as improvement in live birth rates, and that gap is where most marketing sits. Correcting a genuine deficiency helps. Taking supplements on the assumption of deficiency mostly does not.
Boxers versus briefs is the perennial question. The effect, if any, is small compared with smoking, weight and heat exposure. It is not where the leverage is.
Timing still matters
Conception depends on intercourse in the fertile window — roughly the five days before ovulation and the day of it. Every day or every other day across that window is a reasonable approach. Saving up abstinence for a long stretch does not improve the odds and can reduce motility.
The conversation worth having
Male fertility carries stigma that delays assessment, and delay is the one thing that reliably makes fertility problems harder to address. The first test is a single sample. It is a small step that either removes a large uncertainty or finds something treatable.
