There’s no magic number of times you need to have sex to get pregnant. What matters most is timing: having sex during the roughly six-day window each month when conception is actually possible. Couples who have sex every one to two days during that window give themselves the best odds, and more than 80% of couples who have unprotected sex every two to three days throughout the cycle conceive within a year.
Why Timing Matters More Than Frequency
You can only get pregnant during a short stretch of each menstrual cycle, sometimes called the fertile window. This window spans the five days before ovulation, the day of ovulation itself, and the day after. Outside of that roughly seven-day period, conception isn’t possible because there’s no egg available to fertilize.
Sperm can survive inside the reproductive tract for up to five days, which is why sex in the days leading up to ovulation still counts. The egg, once released, only lives about 12 to 24 hours. That asymmetry is why the best strategy is to have sperm already waiting when the egg arrives, rather than trying to time sex to the exact moment of ovulation.
How Often to Have Sex
The simplest approach: have sex every one to two days during your fertile window. If you don’t want to track ovulation at all, having sex every two to three days throughout your entire cycle covers your bases. Both strategies produce similar pregnancy rates.
Daily sex is fine and won’t hurt your chances. A common worry is that frequent ejaculation depletes sperm, but the evidence doesn’t support that concern in a meaningful way. A large meta-analysis found that shorter gaps between ejaculation do lower sperm concentration slightly, but they also reduce DNA damage in the sperm that are present. Motility, which is how well sperm swim, stays roughly the same regardless of whether ejaculation happens daily or every few days. The net effect is that daily sex is at least as effective as every-other-day sex for most couples.
That said, turning sex into a rigid daily obligation can create stress that makes the process harder emotionally. Every other day during the fertile window is a perfectly effective compromise if daily feels like too much pressure.
How Long It Typically Takes
Most couples don’t conceive on the first try, or even the first few. Pregnancy is a numbers game played over months, not a single event. Among women aged 20 to 34 who time sex to their fertile window, about 84% conceive within a year. For women aged 35 to 40, that number is 78%, a smaller gap than many people expect.
A study from the University of North Carolina found that among women 35 to 39 who had sex at least twice a week, 82% conceived within a year, compared to 86% of women aged 27 to 34. For women 38 and 39 who had been pregnant before, 80% of those at a healthy weight conceived naturally within six months. Age does reduce fertility, but the decline is more gradual than the dramatic “fertility cliff” narrative suggests for most women in their mid-to-late thirties.
A reasonable expectation: give it six months of well-timed sex before worrying, or 12 months if you’re under 35. After that point, a fertility evaluation can identify whether something specific is slowing things down.
Tracking Your Fertile Window
Knowing when you ovulate helps you concentrate your efforts during the days that count. There are several ways to do this, and they vary significantly in reliability.
Ovulation Predictor Kits (LH Strips)
These urine test strips detect the surge of luteinizing hormone that triggers ovulation, typically 24 to 36 hours before the egg is released. They’re the most practical and accurate home method, detecting ovulation in about 93% of cycles in comparative studies. You start testing a few days before you expect to ovulate (based on your cycle length) and have sex the day of the positive result and the following two days.
Basal Body Temperature
BBT charting involves taking your temperature every morning before getting out of bed and watching for the slight rise (about half a degree) that follows ovulation. The problem is that the temperature shift confirms ovulation after it’s already happened, so it only helps you predict future cycles based on past patterns. Its accuracy is also limited. Research shows that only about 68% of cycles produce a clear, interpretable temperature shift, and the temperature low point before the rise can vary by as much as eight days before to four days after actual ovulation. One study found that only 22% of confirmed ovulatory cycles showed a clear BBT shift. It’s better than nothing for learning your general pattern, but it’s significantly less reliable than LH strips for pinpointing the right days.
Cervical Mucus
As ovulation approaches, vaginal discharge becomes clearer, slippery, and stretchy, often compared to raw egg whites. This change signals rising estrogen and is a useful, no-cost indicator that your fertile window is open. It works well as a complement to LH testing.
What Doesn’t Actually Matter
Several persistent beliefs about conception have no scientific support. The American Society for Reproductive Medicine has reviewed the evidence and found that sexual position has no effect on the likelihood of pregnancy. Sperm reach the cervical canal within seconds of ejaculation regardless of position. Lying on your back afterward doesn’t help either, despite how intuitive it might seem.
Female orgasm may play a small role in sperm transport, but there is no established relationship between orgasm and fertility outcomes. Stressing about whether orgasm happened won’t change your chances in any measurable way.
One Overlooked Factor: Lubricant Choice
If you use lubricant during sex, the type matters. Most commercial lubricants, and even saliva, can slow sperm movement. Look for lubricants that are hydroxyethylcellulose-based, which don’t impair sperm motility and closely mimic natural vaginal mucus in consistency. Avoid products with fragrances or parabens, and don’t substitute household oils like coconut oil, which can also interfere with sperm function. If you don’t need lubricant, this isn’t something to worry about, but for couples who rely on it, switching to a fertility-friendly option is a simple fix.
Putting It All Together
The practical version is straightforward: have sex every one to three days during the five or six days before and including ovulation. Use LH strips if you want to identify that window precisely, or simply have sex every two to three days all month if tracking feels stressful. Don’t worry about positions, lying still afterward, or whether you’re having sex “too much.” Most couples with no underlying fertility issues will conceive within six to twelve months using this approach.