There are two openings in the vulva (a woman's external sex organs) — the urethra and the vagina. Menstrual fluid flows from the vagina (the lower of the two openings), so this is where a tampon should go.
Which hole does the tampon go in?
Step 3: Getting into a comfortable position
The tampon goes in the vaginal opening, located between the urethra, where pee comes out, and the anus. Using a mirror can be helpful to find exactly where the tampon goes. The vaginal opening usually looks more like an oval-shaped slit rather than a round hole.
How far does a tampon go?
Insert it as far as your middle finger and thumb, at the grip – or middle – of the applicator. Once the barrel is comfortably inside, hold the grip and push with your index finger on the smaller tube to push the absorbent part of the tampon into the vagina. Push this until it meets the grip and your other fingers.