No sexual position has been proven to improve your odds of getting pregnant. The American Society for Reproductive Medicine states this clearly: there is no evidence that coital position affects fertility rates. Sperm can be found in the cervical canal seconds after ejaculation, regardless of position. So if you’ve been stressing about whether missionary is better than any other option, you can stop.
That said, there are things that genuinely do affect your chances of conceiving, and they’re worth understanding. Here’s what the evidence actually shows.
Why Position Doesn’t Matter
The reason position is irrelevant comes down to how sperm travel. The first sperm enter the fallopian tubes within minutes of ejaculation. They don’t rely on gravity to get there. Instead, sperm are self-propelled, swimming through cervical mucus that acts as both a filter and a highway. During ovulation, this mucus thins out and becomes less acidic, creating a more welcoming environment that helps sperm survive and move forward. The mucus also serves as a reservoir, keeping sperm alive for extended periods so they can continue reaching the egg over time.
In short, sperm are designed to reach their destination under their own power. Whether you’re on your back, on top, or standing up, the mechanics of conception work the same way.
What About a Tilted Uterus?
About 1 in 4 women has a uterus that tilts backward toward the rectum instead of forward toward the bladder. This is sometimes called a retroverted or retroflexed uterus. Some fertility resources suggest that specific positions may help with sperm delivery depending on the direction of the tilt. For a backward-tilting uterus, lying on your stomach with your partner behind may aid sperm movement. For a forward-tilting uterus, the missionary position with a pillow under the hips afterward is sometimes recommended.
These suggestions are based on anatomical reasoning rather than clinical trials, and a tilted uterus is not a cause of infertility on its own. If you know you have one and want to try adjusting position, it’s unlikely to hurt, but it’s also not something to worry about if you don’t know your uterus orientation.
Does Lying Down Afterward Help?
This is one of the most persistent pieces of conception advice, and it’s not supported by evidence. Fertility specialists have been direct on this point: lying down after sex does not improve your chances. Sperm are motile and begin swimming toward the cervix immediately. You don’t need to stay on your back, elevate your legs, or prop your hips on a pillow (unless you have a known anatomical variation and want to try it).
If lying still for a few minutes feels relaxing and makes the experience less rushed, go for it. Just know it’s not doing anything mechanical to help sperm reach the egg faster.
What Actually Improves Your Chances
Timing and Frequency
The single most important factor in natural conception is when you have sex relative to ovulation. Your fertile window spans about six days: the five days before ovulation and the day of ovulation itself. For the best chance of getting pregnant, aim for sex every day or every other day during this window. You don’t need to have sex every single day of the month, and doing so won’t meaningfully improve your odds beyond what consistent intercourse during the fertile window provides.
Ovulation typically occurs about 14 days before your next period starts, though this varies. Tracking your cycle with ovulation predictor kits, basal body temperature, or cervical mucus changes can help you identify your most fertile days with more precision than calendar math alone.
Choose the Right Lubricant
This is something many couples overlook. Most commercial lubricants, and even saliva, can slow sperm movement. If you use lubricant during sex, look for one that is hydroxyethylcellulose-based. These products don’t decrease sperm motility and closely match the consistency of natural vaginal mucus. Avoid lubricants with fragrances or parabens, and don’t substitute household oils like coconut oil. Several brands are specifically marketed as “fertility-friendly” or “sperm-friendly,” and these are the ones to reach for when you’re trying to conceive.
If you don’t need lubricant, this isn’t something to add. But if dryness is an issue (which can happen from the stress of trying to conceive on a schedule), switching to a sperm-compatible product is a small change that removes a real obstacle.
The Bigger Picture
Couples trying to conceive often focus on controllable details like position and timing because the process can feel uncertain. The evidence is clear that position is not one of the variables that matters. Timing intercourse to your fertile window, having sex regularly, and avoiding lubricants that impair sperm are the practical steps with actual support behind them. Beyond that, overall health factors like maintaining a healthy weight, not smoking, limiting alcohol, and managing stress play a larger role in fertility than any specific bedroom technique.