It Takes Two to Tango: His 90 Days Matter Too
Before a couple starts trying for a baby, the preparation tends to gather around one person.
She thinks about folate. She tracks her cycle. She changes what she drinks, what she eats, when she exercises. She knows roughly when she ovulates and has probably read something about egg quality late at night, phone tilted towards her in the dark.
He may have stopped using the hot tub.
Maybe.
It is an odd imbalance for something that begins with two cells.
Half the equation
Male factors are involved in roughly half of couples experiencing infertility. Sometimes they are the only factor identified. More often they sit alongside something on her side. Either way, the point is not that every conception is neatly divided fifty-fifty between two perfectly measurable contributions. It is that the male side is far too significant to be treated as supporting cast.
And yet culturally, fertility still tends to live in the female body. There are understandable reasons for that. Women have the cycle. Women carry the pregnancy. Age has a much more visible and dramatic effect on female fertility. Most preconception healthcare is designed around her because most of pregnancy will happen to her.
But conception still begins with an egg and a sperm.
Which means preparing for pregnancy cannot really be a one-person project.
There is another reason the months before trying belong to him too. Sperm are being made continuously, and the process takes a little over two months, followed by further maturation before ejaculation. So the sperm involved in a conception roughly three months from now are being produced now.
That makes the famous ninety-day preconception window more literal for men than it is for women. Not because three impeccable months guarantee better sperm. They do not. But because there is a real renewal cycle underneath the advice, and the conditions in which sperm are being produced can change.
His three months count too.
What seems to matter
Some of the strongest evidence is attached to remarkably ordinary things.
Smoking is one of the clearest. Cigarette smoking is associated with poorer sperm concentration, motility and morphology, as well as greater sperm DNA damage. Vaping has been studied far less, which is not the same thing as being shown to be harmless.
Heat matters too, although the internet has managed to make the subject much more dramatic than it needs to be. Sperm production works best below core body temperature, which is the reason the testes sit outside the body in the first place. Frequent hot tubs, repeated high-heat exposure and habits that keep the testes warmer for long periods can temporarily worsen semen parameters. In many cases, those effects improve once the heat exposure stops.
That does not mean tight underwear is a fertility catastrophe, or that putting a laptop on your legs once has ruined anything. Repeated heat is the more useful thing to think about.
Weight and metabolic health belong in the conversation as well, although this is another subject that gets moralised unnecessarily. Higher body weight is associated with changes in reproductive hormones and, in some studies, poorer semen parameters. Fat tissue participates in hormone metabolism, including the conversion of androgens to oestrogens. This is biology, not a character assessment.
Alcohol is less tidy. Heavy and chronic drinking is associated with poorer semen parameters and altered reproductive hormones. Moderate drinking sits in a much greyer part of the evidence, without the neat threshold most people would prefer. Sleep, stress and general physical health matter too, although the evidence becomes less certain as you move down that list.
Taken together, the picture is not especially exotic. Sperm health appears to respond to many of the same conditions that affect health more broadly. Smoking less. Drinking less heavily. Sleeping enough. Eating adequately. Moving regularly. Avoiding repeated high heat.
Nothing revolutionary. Just a part of preconception that men are rarely told belongs to them.
The things nobody thinks to mention
Then there are the details that are easy to miss because they do not look like fertility issues.
Testosterone is probably the biggest one.
Testosterone replacement therapy and anabolic steroids can suppress the hormonal signals the testes need to produce sperm. In some men, sperm production falls dramatically or stops altogether. It is counterintuitive because something called testosterone sounds as though it should help male fertility, but taking testosterone from outside the body can switch off the signalling required to make sperm inside it.
That does not mean anyone taking TRT should stop it because they read a fertility article. It means fertility belongs in the conversation with the doctor managing it, particularly if pregnancy is somewhere in the near future.
Finasteride is another medication worth naming. It is commonly taken for hair loss and, in some men, has been associated with reduced semen parameters that can improve after stopping. That does not make it a fertility problem for every man who takes it. It simply makes it relevant information rather than something to forget to mention.
Even lubricant has a place here. Some ordinary commercial lubricants impair sperm movement in laboratory testing, so if lubricant is part of sex while trying to conceive, choosing one specifically formulated to be sperm-friendly is a very easy change.
And then there is the old instinct to save up.
Longer abstinence can increase semen volume and total sperm count, which is probably where the idea came from. But longer gaps may also reduce motility and increase sperm DNA fragmentation. For couples trying naturally, regular sex through the fertile window generally makes more sense than preserving everything for one perfectly timed attempt.
Possibly the least objectionable fertility recommendation anyone will receive.
Where food and supplements sit
Nutrition belongs in this conversation more than the fertility aisle sometimes gives it credit for.
Sperm are unusually vulnerable to oxidative stress, and the nutrients involved in protecting cells from that damage are not obscure. Zinc, selenium, vitamins C and E, folate, omega-3 fats and other antioxidants all have biological roles that make them relevant to sperm production and function.
Which is why the idea of supporting sperm health through nutrition is not marketing invented from nothing.
The more difficult question is what happens when those nutrients are isolated, put into a capsule and studied as a fertility intervention. Some trials report improvements in sperm concentration, motility, morphology or measures of oxidative stress. Others find much less. And when the question becomes the one couples actually care about, whether supplementation leads to more pregnancies or more babies, the evidence becomes less certain again.
That distinction matters, but it does not make nourishment secondary.
Sperm are being built continuously, and they require energy, protein, fats, vitamins, minerals and a functioning metabolic environment to do it. A man who eats broadly, gets enough protein, includes plenty of plants, nuts, seeds and other whole-food sources of micronutrients, and avoids living on whatever was easiest to grab at lunch is giving that process more of what it needs.
Not because blueberries or pumpkin seeds are fertility treatments.
Because biology needs raw materials.
Supplements can sit on top of that when they are useful. They can help fill nutritional gaps, make consistency easier, or provide nutrients that are difficult to get reliably from diet alone. What they cannot do is compensate for smoking, heavy alcohol use, a medication suppressing sperm production or an underlying hormonal or structural problem.
The fertility clock is not entirely hers
Male fertility does not have the same biological timeline as female fertility, and pretending otherwise would be unhelpful.
But the opposite idea, that male age does not matter at all, is not right either.
Some semen parameters decline with age and sperm DNA fragmentation tends to increase. The effects are generally more gradual than the decline in female fertility and there is no equivalent of a sudden male fertility cliff, but paternal age is not biologically irrelevant.
Women have carried almost the entire cultural burden of the fertility clock.
We do not need to hand men an identical one.
We can simply acknowledge that both bodies arrive at conception with a history, and that both deserve some attention before the trying begins.
If it takes longer than expected
If a couple does find themselves having difficulty conceiving, this is where the idea of half the equation becomes especially important.
Do not spend months investigating one person while assuming the other is fine.
A semen analysis is one of the standard first-line ways of assessing male fertility. It looks at sperm concentration, total count, motility and morphology, alongside other characteristics of the sample. The results are not a pass or fail, and they are not a verdict on whether someone can become a father.
Semen parameters vary, sometimes considerably, even within the same man. An unfavourable result is often repeated before anyone decides what it means.
And some causes of male subfertility have very little to do with lifestyle. Varicocele, hormonal conditions, previous undescended testes, infections, obstruction and genetic factors can all sit underneath an abnormal result.
That is the point where more optimisation becomes less useful than more information.
But that is for later, if later comes.
The reason to think about sperm health before trying is not to medicalise conception before it has even begun. It is simply to include him in the preparation.
The part that is not biological
There is another imbalance here that has nothing to do with sperm count.
Women are taught to think about fertility remarkably early. By the time many couples decide to try, she may already have been carrying information, anxiety and responsibility around it for years.
Men are often given almost nothing.
Which means involving him can very easily become another job for her. She sends the article. She buys the supplement. She reminds him about the sauna. She tells him when the fertile window is.
That is not really half the equation either.
The better version is ownership.
He understands that the months before trying belong to him too. He knows that smoking, heavy drinking, repeated heat and certain medications are worth thinking about. He understands that his age and his health are part of the picture. And if conception takes longer than expected, investigating his side feels normal rather than accusatory.
Not because someone has to be responsible when pregnancy does not happen.
Because two people are trying to make one.
Women have carried the preparation for long enough.
Half the equation deserves half the attention.