Having sex every one to two days during your fertile window gives you the best chance of getting pregnant. That fertile window is roughly six days long, ending on the day you ovulate. Beyond that window, the frequency matters less than you might think, and stressing over a rigid schedule can do more harm than good.
The Short Answer: Every 1 to 2 Days
The American Society for Reproductive Medicine recommends intercourse every one to two days during the fertile window for the highest chance of conception. Daily sex during that window may offer a slight edge, but the difference is small. One study found that cycle-level pregnancy rates were similar whether couples had sex daily, every other day, or even every three days during the fertile window. The only group with noticeably lower success was couples who had sex just once during the entire window.
The practical takeaway: every other day works nearly as well as daily, so go with whatever feels sustainable and enjoyable for both of you. Pregnancy rates actually increase with more frequent intercourse overall, and couples should not limit how often they have sex out of concern that it might lower their chances.
When Your Fertile Window Actually Is
Your fertile window spans the five days before ovulation and the day of ovulation itself. This six-day stretch exists because sperm can survive three to five days inside the cervix, uterus, and fallopian tubes, waiting for an egg to be released. The egg itself only survives about 12 to 24 hours after ovulation, so timing sex before ovulation is more reliable than trying to catch the egg afterward.
Conception odds vary across the window. The highest-probability days are the day before ovulation and the day of ovulation itself, where a single act of intercourse carries roughly a 29 to 39 percent chance of conception. Two days before ovulation is also strong, at around 23 percent. The odds drop further out but remain meaningful as far as five days before ovulation, at roughly 10 to 22 percent. Having sex on multiple days within this window stacks those probabilities, which is why the “every one to two days” guideline works so well.
For a typical 28-day cycle, ovulation usually happens around day 14. If you use ovulation predictor kits that detect the LH hormone surge, ovulation generally follows 28 to 36 hours after the surge begins, or 8 to 20 hours after the surge peaks. Starting to have sex a few days before you expect ovulation is a reliable strategy, since sperm already present in the fallopian tubes can fertilize the egg as soon as it appears.
Does Daily Sex Lower Sperm Quality?
This is one of the most common concerns couples have, and the answer is reassuring. Daily ejaculation does reduce semen volume and total sperm count, but not enough to hurt your chances. In a study tracking men who ejaculated daily for two weeks, semen volume dropped from about 3.8 mL at baseline to 2.2 mL by day three, and total sperm count fell from 252 million to about 106 million. After that initial drop, though, the numbers plateaued. Days 3 through 14 showed no additional meaningful decline.
Crucially, sperm motility (how well sperm swim) and morphology (their shape) did not change significantly across two weeks of daily ejaculation. Motility hovered around 59 to 67 percent throughout. Even at the lower sperm counts, the numbers remained well within the range needed for natural conception. So if daily sex feels right for you and your partner, there is no biological reason to hold back.
How to Track Ovulation
If you want to time things more precisely, a few methods can help you identify your fertile window. Ovulation predictor kits (available at any pharmacy) detect the LH surge in your urine and give you roughly one to two days of notice before ovulation. Tracking basal body temperature works too, but it confirms ovulation after the fact rather than predicting it, since your temperature rises slightly after the egg is released. Cervical mucus changes are another useful signal: the stretchy, clear, egg-white consistency that appears in the days leading up to ovulation indicates peak fertility.
That said, the ASRM notes that ovulation prediction methods can sometimes add unnecessary stress. If tracking ovulation feels burdensome, having sex every two to three days throughout your cycle is a perfectly reasonable alternative that ensures sperm are present whenever ovulation occurs.
Lubricants Can Affect Sperm
If you use lubricant during sex, the type matters. Most common lubricants significantly reduce sperm motility on contact. KY Jelly and Durex-brand lubricants are particularly harmful. Durex showed a significant drop in both sperm motility and sperm survival within 60 minutes. Vaseline and baby oil also reduced progressive sperm movement at certain time points.
Pre-Seed is the one widely available lubricant that performed comparably to natural vaginal fluid in studies, showing minimal impact on sperm at any time point. If you need a lubricant while trying to conceive, it’s the safest option. Alternatively, increased foreplay can help with natural lubrication, and some couples find they can skip lubricant entirely during the fertile window when cervical mucus production is at its highest.
What If It’s Taking Longer Than Expected?
About 80 percent of couples conceive within six months of trying, and roughly 85 to 90 percent within a year. If you’re under 35 and have been having regular, well-timed sex for 12 months without success, a fertility evaluation for both partners is a reasonable next step. For women 35 and older, that timeline shortens to six months, since egg quality and quantity decline with age and earlier intervention can make a significant difference.
In the meantime, the most impactful things you can do are straightforward: have sex every one to two days around ovulation, avoid lubricants that harm sperm, and try not to turn the process into a clinical routine. Stress and pressure around timed intercourse can reduce sexual satisfaction and, in some cases, make couples have sex less often, which is counterproductive. The best frequency is the one you can maintain consistently, cycle after cycle.