The Intrauterine Device (IUD) is a small, T-shaped device placed inside the uterus. It features two thin strings that extend through the cervix into the top of the vaginal canal. It is common and normal for a partner to occasionally feel these strings during intercourse, which can sometimes be surprising or cause slight discomfort. This sensation is rarely a sign of a problem and is simply a physical reality of this contraceptive method.
Why the IUD Strings Are Felt
The IUD strings are a necessary component, typically made of thin, flexible materials, designed to allow a healthcare provider to remove the device when needed. After insertion, the provider trims these threads so they extend approximately one to two inches into the upper part of the vagina, curling around the entrance to the cervix. In a normal position, the strings are generally soft and pliable, often tucked away and not noticeable.
The strings’ presence becomes more apparent during sexual activity, particularly with deep penetration that reaches the cervix. The feeling a partner experiences is often described as a slight scratch or a sensation similar to stiff fishing line, especially if the strings are newly trimmed and have not yet softened or coiled fully. The natural movement of the uterus and cervix during arousal and deep thrusting can push the cervix further, increasing the likelihood of contact with the strings.
Cyclical changes in the cervix’s position throughout the menstrual cycle influence string sensation. During menstruation, the cervix naturally sits lower in the vaginal canal, making the strings more accessible and noticeable. Conversely, closer to ovulation, the cervix tends to rise higher, often pulling the strings further out of reach. This anatomical movement explains why the strings might seem to change in length or visibility from week to week.
When String Sensation Requires Medical Attention
While a partner feeling the strings is normal, certain sensations or physical changes can indicate that the IUD has shifted out of its correct placement inside the uterus. If the partner can feel the hard, plastic body of the IUD itself, rather than just the soft, flexible strings, this suggests movement. If the device has partially expelled into the cervical canal or vagina, its firm structure will be noticeable and may cause sharp or severe pain during sex.
Contact your healthcare provider immediately if you notice a sudden change in the length of the strings when performing a self-check. This includes the strings feeling much longer than usual, suggesting the IUD may have moved lower, or if the strings are completely absent. String absence could mean they have retreated up into the cervical canal or that the IUD has been expelled from the uterus entirely.
Other symptoms indicating a potential complication include new, persistent pain during intercourse, severe cramping, or a change in bleeding patterns, such as heavy or irregular bleeding. Signs of a pelvic infection, such as fever, chills, or unusual vaginal discharge, should also prompt an immediate medical evaluation. These symptoms suggest the device may be compromised and its contraceptive effectiveness could be reduced.
Practical Solutions for Reducing Partner Sensation
If a partner consistently reports discomfort from the IUD strings, consult the healthcare provider about trimming the strings shorter. This simple procedure may alleviate the poking sensation by reducing the length of the threads that extend into the vagina. However, shorter strings can make it more difficult for the IUD user to perform monthly self-checks or for a provider to grasp them for removal.
Many couples find that simply waiting a few weeks to months after insertion resolves the issue, as the strings naturally soften and become more pliant over time. The material’s texture changes as it is exposed to the vaginal environment, causing the strings to curl up and conform closely to the contours of the cervix. This softening often tucks the threads out of the direct path of penetration, making them less noticeable.
Exploring alternative sexual positions can also be an effective solution to mitigate discomfort. Positions that limit the depth of penetration, such as those where the receiving partner is on top, can reduce the chance of the partner’s body contacting the cervix and the strings. Adjusting the angle or speed of movement can help a couple find a comfortable rhythm that avoids irritating the sensitive tissue near the cervical opening.