During vaginal intercourse, the penis enters the vaginal opening, which is the middle of three openings in the vulva area. It sits below the urethral opening (where urine comes out) and above the anus. Understanding exactly where these openings are and how they differ helps clear up a surprisingly common question.
Three Openings and Their Locations
The vulva, the external genital area, contains three distinct openings arranged in a line from front to back. Starting from the front (closest to the belly), the first is the urethral opening, which is a tiny hole used only for urination. Just below that is the vaginal opening, which is noticeably larger. And further back is the anus.
The urethral opening is small, only about 1.5 inches of tube behind it, and it serves no role in intercourse. It can be easy to confuse with the vaginal opening because they’re close together, but the urethra sits right below the clitoris, while the vaginal opening is lower and further back, between the inner lips (labia minora). A thin membrane called the hymen partially covers the vaginal opening in some people, though it often wears away naturally over time.
How To Locate the Vaginal Opening
The vaginal opening is surrounded by several structures that serve as landmarks. The inner lips of the vulva extend downward from the clitoris and frame the vaginal opening on either side. If you follow these inner lips down past the small urethral opening, the next and more prominent opening is the vaginal entrance.
Small glands called Bartholin’s glands sit on each side of the vaginal opening. These glands secrete fluid that helps lubricate the vagina during arousal, which is one reason the area becomes slippery and easier to locate by feel when a person is aroused. Additional lubrication from a water-based lubricant can also help, especially for anyone who finds penetration uncomfortable.
What the Vaginal Canal Feels Like Inside
The vaginal canal is not a wide-open space. It’s a muscular, flexible tube that naturally rests with its walls touching. When not aroused, it averages about two to four inches in length. During arousal, the canal relaxes and expands to roughly four to eight inches, which is how it accommodates a penis or other object comfortably.
At the deepest point of the vaginal canal is the cervix, a firm, muscular structure that acts as the gateway between the vagina and the uterus. The cervix sits anywhere from three to six inches inside and feels like a small, rounded bump with a slight dimple in the center. It effectively forms a barrier: the penis does not pass through the cervix during intercourse. During reproduction, however, sperm travel through the cervical mucus, enter the uterus, and move into the fallopian tubes where fertilization can occur.
Why Angle and Position Matter
The vaginal canal doesn’t point straight up into the body. It angles slightly toward the lower back, which is why the angle of penetration matters for comfort. Depending on the position, the natural curve of the canal may make entry easier or require slight adjustment. If penetration feels like it’s hitting a wall or isn’t going in smoothly, the angle is likely off. Shifting hips, changing positions, or tilting the pelvis can correct this.
Arousal plays a direct role in comfort. When a person with a vagina is fully aroused, the canal lengthens, the walls produce natural lubrication, and the muscles around the opening relax. Attempting penetration before sufficient arousal is one of the most common reasons it feels difficult or painful. Taking more time with foreplay or using lubricant makes a significant difference.
What About Anal Penetration
The anus is the third opening, located behind the vaginal opening. Some people engage in anal penetration, but the anatomy here is quite different. The anus is surrounded by two ring-shaped muscles called sphincters. The outer sphincter is under conscious control, while the inner one operates involuntarily. Unlike the vagina, the anus does not produce its own lubrication, so external lubricant is essential to prevent tearing of the delicate tissue lining the area. The lower portion of the anal canal is also highly sensitive to pain due to its nerve supply.
Accidentally entering the anus instead of the vagina is uncomfortable and can cause injury to the delicate anal tissue. Being aware of the positioning of both openings helps avoid this. The vaginal opening is further forward (toward the front of the body), while the anus is further back, closer to the tailbone.
Common Reasons for Confusion
This question comes up more often than people might expect, and for understandable reasons. Sex education varies widely, and many people never receive a clear anatomical explanation. The vulva’s three openings are close together, the urethral opening is nearly invisible to the eye, and the vaginal opening can be partially obscured by the labia or hymen. In low light or an unfamiliar situation, it’s genuinely difficult to distinguish these structures by feel alone.
Communication between partners is the simplest solution. Guiding with a hand, adjusting positioning together, or simply asking removes the guesswork. There’s nothing unusual about needing a moment to find the right angle and location, especially during early sexual experiences.