The short answer: Have sex every 1–2 days through your fertile window — the six days ending on the day of ovulation. Every-other-day is the sweet spot, daily is just as good, and 2–3 times a week is nearly as effective. “Saving up” sperm does not help (ASRM, 2022).
Written and medically reviewed by Dr Shah Dupesh, MBBS, DCE, FASM — Consultant Andrologist, Chennai.
Let me answer this the way I answer it in my clinic almost every week — how frequently should you have sex to get pregnant? — because it is one of the most common questions couples ask me when they start trying for a baby. There is a lot of confusing advice out there — some of it from very well-meaning relatives — so let me give you the honest, evidence-based version, and then add what I actually see in practice.
Quick facts
- The “fertile window” is about 6 days long — the 5 days before ovulation plus the day of ovulation itself (Wilcox et al., 1995).
- Sperm can survive in the female reproductive tract for up to 5 days; the egg lives only about 12–24 hours after ovulation (ACOG).
- The single highest-chance day is the day of ovulation — roughly a 1-in-3 conception probability from one act of intercourse (Wilcox et al., 1995).
- Having sex every 1–2 days during the fertile window gives the highest pregnancy rates; 2–3 times a week is nearly equivalent (ASRM, 2022).
- Long abstinence does not improve your chances — after more than 5 days without ejaculation, sperm quality can actually drop (ASRM, 2022).
Now, here is something I want to clear up straight away. For years the standard advice — including, I will admit, the older version of this very article — was “three times a week, nothing more, nothing less, and do not bother tracking ovulation.” Based on the current evidence from the ASRM, ACOG and NICE, that advice is outdated. Let me explain what we now know.
What is the fertile window?
You can only conceive on a handful of days each cycle. This is the fertile window: the six days that end on the day of ovulation (Wilcox et al., 1995). It works this way because of simple biology — sperm are the patient ones. Healthy sperm can wait inside the female tract for up to five days, so intercourse a few days before ovulation can still result in pregnancy when the egg finally arrives. The egg, on the other hand, is in a hurry: once released, it can only be fertilised for about 12 to 24 hours (ACOG).
So the goal is simple — have sperm already waiting when the egg is released.
Your chance of conceiving by day (the timing that matters)
The landmark New England Journal of Medicine study by Wilcox and colleagues followed 221 women and found conception happened only within that six-day window — and the probability climbed steeply as ovulation approached (Wilcox et al., 1995):
| When you have sex | Approx. chance of conception (per act) |
|---|---|
| 5 days before ovulation | ~10% |
| 2 days before ovulation | ~25% |
| Day before ovulation | ~30% |
| Day of ovulation | ~33% (the peak) |
| Day after ovulation | Near zero (the window has closed) |
These are approximate, per-act probabilities from Wilcox et al. (1995); the intermediate values are interpolated. The practical point: your peak fertility is the 2–3 days leading up to and including ovulation.
The takeaway: you do not need to have sex every single day of the month. You need to cover the few days leading up to and including ovulation.
Talk to a fertility specialist
Every day vs every other day vs 2–3 times a week
Here is where the most up-to-date guidance differs from the old “3 times a week” rule.
The ASRM, in its 2022 committee opinion Optimizing Natural Fertility, is clear: intercourse every 1 to 2 days during the fertile window yields the highest pregnancy rates (ASRM, 2022). Daily intercourse and every-other-day intercourse give almost identical results. And importantly — couples should not be told to limit how often they have sex.
NICE in the UK puts it slightly more simply for the whole cycle: vaginal intercourse every 2 to 3 days optimises the chance of pregnancy (NICE NG257), which is why a year of regular intercourse without conceiving is the usual point to seek help.
My practical recommendation — and what I tell most couples in my clinic — is every other day across the fertile window. Why every other day rather than daily? Two reasons. First, it is genuinely as effective as daily, so you lose nothing. Second, and this is the part the guidelines do not say out loud: a rigid “we must do it tonight” schedule is one of the fastest ways to drain the joy out of intimacy and, in some men, to trigger performance anxiety and even erectile difficulty. Every-other-day keeps the chances optimal and keeps the bedroom from turning into a chore.
Should you “save up” sperm? (the abstinence myth)
This is my home turf as an andrologist, and it is the myth I bust most often. Many couples believe that abstaining for a week or two will “build up” a stronger, more potent batch of sperm for the big day. The opposite is closer to the truth.
The data the ASRM reviewed is striking: in men with normal semen quality, sperm concentration and motility stay normal even with daily ejaculation. And in men with a low sperm count (oligozoospermia), concentration and motility are often highest with daily or near-daily ejaculation. Once abstinence stretches beyond about 5 days, sperm parameters can begin to deteriorate, and after 10 or more days they get worse (ASRM, 2022). In the lab I also see that very long abstinence tends to leave sperm with more DNA damage from oxidative stress — another reason saving up can backfire.
So no — do not save it up. Frequent, regular ejaculation keeps your sperm fresh.
What if the man has a low sperm count?
This deserves its own note, because the general advice flips slightly for men with male-factor infertility. In my clinical experience, for a man with a genuinely low count, very long abstinence before the fertile window is counterproductive — it often lowers the count and motility further rather than boosting it. In fact, in many men with a low count, sperm concentration and motility are highest with daily or near-daily ejaculation (ASRM, 2022) — so counter-intuitively, having sex every day through the fertile window can be the better strategy, not saving up for it. If you suspect a low count, the frequency conversation is secondary to getting a proper semen analysis and an andrology workup — read more in my guide to low sperm motility.
Things that genuinely do not matter (stop worrying about these)
Couples spend a lot of anxious energy on things that have no real effect on conception:
- Sex position. No particular position improves your chances. The ASRM states plainly that specific coital positions have no impact on fertility (ASRM, 2022).
- Lying down with legs in the air after sex. It feels logical, but there is no evidence that postcoital posture changes conception rates (ASRM, 2022). Sperm reach the cervical mucus within minutes.
- Lubricants — this one is the exception. If you use a lubricant, be careful. Many common water-based lubricants reduce sperm motility by 60–100% in laboratory testing, and so do olive oil and saliva (ASRM, 2022). If you need lubrication while trying to conceive, choose a fertility-friendly product (or canola oil, which ASRM notes does not impair sperm).
When tracking actually helps
The old advice said “never track ovulation, it only causes stress.” I no longer agree, and neither do the guidelines. Knowing when your fertile window falls is genuinely useful — especially if you have a busy schedule or slightly irregular cycles. Helpful, low-stress tools include:
- Ovulation predictor kits (they detect the LH surge ~24–36 hours before ovulation),
- Cervical mucus changes (it becomes clear, stretchy and egg-white-like near ovulation), and
- Basal body temperature charting over a few cycles to learn your pattern.
The caveat is real, though: use tracking to guide your timing, not to turn conception into a high-pressure military operation. If you find tracking is making you anxious, simply default to every-other-day across mid-cycle — you will cover the window anyway.
A clinical tip I give every couple — and this one matters. Let the female partner quietly keep track of the fertile window, but she should not announce “today is the day” to her husband. I see this constantly in my clinic: the moment a man is told to perform on a fixed date — often on the gynaecologist’s instruction to “have sex on the ovulation day” — the pressure can trigger situational erectile dysfunction. The harder he tries to perform on command, the worse it gets, and this performance anxiety can genuinely lower a couple’s chances of conceiving. So my advice is simple: she tracks, she gently makes sure intimacy happens around the right days, but she keeps the calendar to herself. Keep it spontaneous, aim for every-other-day through that week, and let nature do the rest.
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When should you see a specialist?
Most healthy couples having regular, unprotected sex conceive within a year, so the usual advice is to seek a fertility assessment after 12 months of trying. But go sooner — at the outset, not after a year — if the female partner is 35 or older, if periods are irregular or absent, or if either partner has a known issue such as previous fertility problems or a history of testicular problems (ASRM, 2022; NICE now advises referral at presentation for women aged 36 and over, NICE NG257).
If that is you, please do not wait and worry. A basic workup — including a semen analysis for the man — is simple, and it often gives reassuring answers quickly. When in doubt, a short consultation with a specialist clears up far more anxiety than months of guessing.
The most common mistake I see is not too little sex — it is too much pressure. Couples come to me exhausted, having turned trying-for-a-baby into a stressful nightly target, and in some men this anxiety itself causes erectile or ejaculatory difficulty that makes conception harder. My advice is almost always the same: relax the schedule to gentle, every-other-day intimacy through the fertile window, stop “saving up,” and let your bodies do what they are designed to do. Conception is usually a matter of time and consistency, not heroics.
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Frequently asked questions
How many times a week should you have sex to get pregnant?
Aim for every 1–2 days during your fertile window; across the whole cycle, 2–3 times a week comfortably covers it. Every-other-day is the practical sweet spot (ASRM, 2022; NICE NG257).
Does having sex every day reduce sperm count?
No. In men with normal semen quality, daily ejaculation keeps concentration and motility normal. In men with a low count, daily or near-daily ejaculation often gives the best results (ASRM, 2022).
Does sex position affect getting pregnant?
No. No coital position has been shown to improve conception (ASRM, 2022).
Should I lie down after sex to conceive?
There is no evidence that lying down or raising your legs after sex improves your chances (ASRM, 2022). Sperm enter the cervical mucus within minutes.
How long does it usually take to get pregnant?
Most couples having regular unprotected sex conceive within a year. Seek a fertility check after 12 months — or sooner if the woman is 35 or older, or either partner has a known issue (ASRM, 2022; NICE NG257).
Related reading
- Does penis size matter for getting pregnant?
- How long should you lie down after sex to conceive?
- Semen analysis explained — with a free WHO-criteria calculator
- No sperm when I ejaculate? Causes and what to do
About the author
Dr Shah Dupesh, MBBS, DCE, FASM is a Consultant Andrologist in Chennai specialising in male infertility and sexual medicine. This article reflects current ASRM, ACOG and NICE guidance alongside his first-hand clinical experience.
References
- Practice Committee of the American Society for Reproductive Medicine. Optimizing natural fertility: a committee opinion. Fertility and Sterility. 2022;117(1):53–63.
- American College of Obstetricians and Gynecologists (ACOG). Trying to Get Pregnant? Here’s When to Have Sex.
- National Institute for Health and Care Excellence (NICE). Fertility: assessment and treatment (NICE guideline NG257). 2026. (Replaces the withdrawn CG156.)
- Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation. New England Journal of Medicine. 1995;333(23):1517–21.
- Stanford JB, Dunson DB. Effects of sexual intercourse patterns in time to pregnancy studies. American Journal of Epidemiology. 2007;165(9):1088–95.
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