When conceiving takes longer than expected, attention still tends to turn first – sometimes only – to the woman. It is one of the most persistent assumptions in reproductive health, and one of the least accurate. Fertility is a shared biological process, and when it does not go to plan, the reasons are just as likely to involve the male partner. Modern fertility medicine treats it as a couple-level question from the start, and there is good evidence for doing so.

This article explains why both partners are generally evaluated together, what male and female assessment involves, and when a couple should seek help. The language throughout is deliberately neutral: infertility is a medical situation to understand, not anyone’s fault to assign.

What infertility means clinically

Clinically, infertility is usually defined as not conceiving after 12 months of regular, unprotected intercourse – or after 6 months if the female partner is 35 or older, because time matters more with age. It is common: the World Health Organization estimated in 2023 that around 1 in 6 people worldwide experience infertility at some point in their lives. “Infertility” is also not the same as “sterility”; many couples who meet the definition go on to conceive, with or without help. It is best read as a signal to evaluate, not a final verdict.

Why fertility is a couple-level issue

The single most important fact in this whole topic is that difficulty conceiving is roughly as likely to involve the man as the woman. Broadly, the causes distribute across four overlapping groups, and the proportions vary between studies :

• Female factors – such as ovulation disorders, tubal, uterine or age-related issues.
• Male factors – problems with sperm production, quality or delivery. Male factors are involved in roughly half of couples, as a sole or contributing cause.
• Combined factors – contributions from both partners at once, which is common.
• Unexplained infertility – no clear cause found on standard testing, in a meaningful minority of couples.

Because male and combined factors together account for a large share, evaluating only one partner risks missing half the picture – and wasting months. That is the core rationale for assessing both.

Female fertility factors, in brief

Female-factor infertility spans several well-understood areas. Ovulation disorders – where eggs are released irregularly or not at all – are among the most common; Surishi’s guide to ovulatory dysfunction explains how this affects conception. Polycystic ovary syndrome (PCOS) is a frequent underlying cause of irregular ovulation, covered in PCOS and infertility and PCOS and pregnancy. Endometriosis can affect fertility through inflammation and anatomy – see endometriosis and fertility. Tubal factors (blocked or damaged fallopian tubes) and uterine factors (such as fibroids or polyps) can prevent fertilisation or implantation. And ovarian reserve declines with age, which affects both egg quantity and quality – explored in why egg quality matters more than egg count and the guide to AMH.

Male fertility factors, in brief

Male-factor infertility is at least as varied, and often overlooked because the assessment is so simple. It usually comes down to the number, movement, shape or delivery of sperm.

• Sperm count (concentration) – how many sperm are present. A low count reduces the odds per cycle.
• Motility – how well sperm move, which they must do to reach and fertilise an egg.
• Morphology – the proportion of normally shaped sperm.

These are measured by a semen analysis, a straightforward, non-invasive test that is the cornerstone of male evaluation. Results are compared against the WHO 2021 (6th edition) reference limits – for example, a sperm concentration around 16 million per millilitre and total motility around 42% – but these are population reference points from men who fathered children, not strict pass/fail lines, so results are always interpreted by a clinician in context, and a single abnormal test is usually repeated. Beyond sperm parameters, varicocele – enlarged veins in the scrotum – is the most common correctable cause of male infertility; hormonal imbalances, genetic factors, infections, prior surgery and problems with ejaculation or delivery can also contribute.

Lifestyle factors that affect both partners

Several everyday factors influence fertility on both sides, which is another reason a couple-level view helps.

• Smoking – associated with harm to both egg and sperm health; stopping is one of the clearest evidence-based steps for either partner.
• Alcohol – heavy use is linked to reduced fertility in both sexes, and there is no established safe amount in pregnancy.
• Weight and metabolic health – both high and very low body weight can affect ovulation in women and sperm parameters in men.
• Heat exposure – sperm production is temperature-sensitive; frequent high heat to the groin (such as prolonged hot tubs) is associated with lower sperm quality, though effects are usually reversible.
• Certain medications and substances – some prescription drugs, anabolic steroids and recreational substances affect fertility in either partner. Review these with a doctor – never simply stop a prescribed medicine on your own.

Timing: sexual frequency and the fertile window

Sometimes the issue is not biology but timing. Conception is most likely from intercourse in the fertile window – the roughly six days ending on the day of ovulation – because sperm survive up to about five days and the egg for around a day. Regular intercourse across that window, rather than trying to pinpoint a single day, gives the best natural chance. Very infrequent intercourse, or mistiming the window, can look like a fertility problem when it is really a timing one – which a consultation quickly clarifies.

When couples should seek evaluation

The usual guidance: seek evaluation after 12 months of trying if the female partner is under 35, or after 6 months if she is 35 or older. Go sooner – sometimes straight away – if there are known reasons to, such as irregular or absent periods, PCOS, endometriosis, previous pelvic surgery or infection, recurrent miscarriage, or a known male-factor history such as prior testicular surgery, injury or chemotherapy. Seeking advice does not mean IVF is inevitable; it means understanding what, if anything, needs attention.

What initial fertility evaluation typically involves

A first evaluation is usually straightforward and starts with both partners together. For the man, it centres on history and a semen analysis. For the woman, it typically includes a medical and menstrual history, blood tests to assess ovulation and hormones (and ovarian reserve where relevant), and imaging of the uterus and fallopian tubes. A physical examination and lifestyle review apply to both. The aim of this first round is to map the landscape, not to reach an immediate diagnosis.

Why both partners are tested at the same time

Testing both partners in parallel is not about doubling up – it is about not wasting time. Because male factors are common and combined factors even more so, evaluating the woman alone can lead to months of investigation and treatment while a contributing male factor goes undetected. A semen analysis is quick, inexpensive and non-invasive, so there is little reason to delay it. Parallel testing also keeps the process genuinely shared, which matters for couples navigating something stressful together.

What happens if no obvious cause is found

In a meaningful minority of couples, standard testing finds no clear cause – this is unexplained infertility. It can be one of the more frustrating outcomes, because “no cause found” is not the same as “nothing wrong.” It usually means the cause is subtle or beyond the reach of routine tests. Importantly, unexplained infertility is not a dead end: several effective management options exist, and a fertility specialist can talk through them based on age, history and how long the couple has been trying.

Preconception health for both partners

Preparing for pregnancy is a two-person project. Both partners benefit from a broadly healthy diet, not smoking, moderating alcohol, managing weight and sleep, and correcting any confirmed nutritional deficiencies; the woman should also take folic acid before conception. Sperm take roughly two to three months to develop and eggs mature over a similar window, so lifestyle changes are best started a few months ahead. Antioxidant nutrition is sometimes discussed for both partners in this context: a Cochrane review of antioxidants in male subfertility found sperm measures may improve but concluded the effect on live births is uncertain, so the honest framing is may support, not proven to work. Surishi’s CoQ10 for fertility article covers this evidence, and its AstaCOQ10 is a preconception antioxidant-nutrition formulation positioned for both partners – a supplement to discuss with a doctor, never a substitute for evaluation.

Common myths about infertility

• “Infertility is usually the woman’s issue.” Male factors are involved in roughly half of couples. Evaluating one partner alone misses much of the picture.
• “If he has no symptoms, his fertility is fine.” Most male-factor infertility has no outward symptoms; only a semen analysis can assess it.
• “We’re healthy, so timing can’t be the problem.” Mistiming the fertile window is a common, easily fixed reason for delay.
• “One abnormal semen test means infertility.” Results vary; an abnormal test is usually repeated and interpreted in context.
• “Infertility always means IVF.” Many causes are managed with simpler measures; IVF is one option among several.

How to prepare for a fertility consultation

A little preparation makes the first appointment far more productive, and it works best when both partners attend. Bring the woman’s menstrual-cycle history (length, regularity, any pain), details of how long you have been trying and your timing, both partners’ medical and surgical histories, any previous pregnancies, a list of all medicines and supplements, and notes on lifestyle factors. Writing down your questions in advance helps too – consultations move quickly.

A practical checklist for both partners

• Both attend the first consultation together where possible.
• Track the woman’s cycle – length, regularity, any pain or irregular bleeding.
• Note how long you’ve been trying and how you’ve been timing intercourse.
• List each partner’s medical/surgical history and any past pregnancies.
• List all medicines and supplements for both partners.
• Be ready for a semen analysis early – it’s quick and non-invasive.
• Start healthy lifestyle changes for both a few months ahead.
• Write down your questions before the appointment.

Key takeaways

Fertility is shared biology, and difficulty conceiving is roughly as likely to involve the male partner as the female one. That is why evaluation begins with both partners, why a simple semen analysis belongs early in the process, and why framing any of this as one person’s “fault” is both inaccurate and unhelpful. If you are under 35 and have been trying for a year, or 35 or older and trying for six months – or have known reasons to act sooner – a joint evaluation is the most useful next step. It rarely means the worst; it usually means answers.

FAQs :

Q1. Why should both partners be tested for fertility, not just the woman?

Because difficulty conceiving is roughly as likely to involve the man as the woman – male factors are involved in about half of couples, and combined factors are common. Testing only one partner can miss half the picture and waste months. A semen analysis is quick and non-invasive, so both partners are usually evaluated in parallel.

Q2. Whose ‘fault’ is infertility?

It isn’t a matter of fault. Infertility can involve female factors, male factors, both together, or no clear cause on standard testing. It’s a medical situation to evaluate and manage, not a blame to assign to either partner.

Q3. What does male fertility testing involve?

It usually starts with a medical history and a semen analysis – a simple, non-invasive test measuring sperm count, motility and shape, compared against WHO 2021 reference limits. Results are interpreted by a clinician in context, and an abnormal test is typically repeated. Further tests (hormones, examination for varicocele, genetic testing) may follow if needed.

Q4. What does female fertility testing involve?

Typically a medical and menstrual history, blood tests to assess ovulation, hormones and ovarian reserve where relevant, and imaging of the uterus and fallopian tubes, alongside a physical examination and lifestyle review.

Q5. When should a couple see a fertility specialist?

After 12 months of trying if the woman is under 35, or 6 months if she is 35 or older – sooner if there are known issues such as irregular periods, PCOS, endometriosis, recurrent miscarriage, or a male history such as prior testicular surgery or chemotherapy.

Q6. What is unexplained infertility?

It means standard testing found no clear cause. That isn’t the same as ‘nothing wrong’ – the cause is usually subtle or beyond routine tests. It isn’t a dead end; a specialist can discuss several effective management options based on your situation.

Q7. Can lifestyle changes help both partners?

Yes. Not smoking, moderating alcohol, managing weight and sleep, and correcting confirmed deficiencies support fertility in both partners. Because sperm and eggs develop over roughly two to three months, it’s best to start changes a few months before trying.

Medical Disclaimer

This article is for general educational and informational purposes only and does not diagnose infertility or provide individualized treatment advice. It is not a substitute for evaluation by a qualified fertility specialist or reproductive medicine professional. Fertility is individual, and decisions about testing, treatment, medicines or supplements – for either partner – should be made with a licensed healthcare professional following appropriate assessment. Do not start, stop or change any medication or supplement based on this article. If you have been trying to conceive without success, or have concerns about fertility, please seek personalised medical guidance for both partners. Surishi Pharmaceuticals’ products referenced here are described for educational context only and should be used only as directed by a healthcare professional.