An internal condom (sometimes called a female condom) is a soft pouch made of nitrile, a thin synthetic plastic, that lines the inside of the vagina or anus during sex. It works by creating a physical barrier that catches semen and prevents skin-to-skin contact, protecting against both pregnancy and STIs. Unlike external condoms worn on a penis, this one is inserted ahead of time and gives the wearer direct control over their own protection.
Design and How It Creates a Barrier
The internal condom is a loose-fitting tube with a flexible ring at each end. The smaller, thicker ring at the closed end sits deep inside the vagina, resting against the cervix to hold the condom in place. The larger, thinner ring at the open end stays outside the body, partially covering the vaginal opening. During sex, the penis moves inside the pouch rather than making direct contact with vaginal walls.
That outer ring is a key design difference from external condoms. Because it covers some of the skin around the vaginal opening, it offers a wider zone of protection against STIs that spread through skin contact, like herpes and HPV. The FC2 Internal Condom is the only version approved by the FDA in the United States.
How to Insert and Use One
Open the package carefully to avoid tearing the condom. Hold the closed end with the inner ring facing you, then squeeze the sides of that ring together between your thumb and forefinger so it narrows enough to slide in. Find a comfortable position (standing with one foot up, squatting, or lying down all work), then push the condom into the vagina with your finger until the inner ring rests against the cervix, similar to inserting a tampon. Make sure the condom isn’t twisted inside.
About an inch of the condom, including the outer ring, will hang outside the body. This is normal. When sex begins, guide the penis into the opening of the condom rather than alongside it. If the condom slips or the outer ring gets pushed inside, stop and reposition it.
One practical advantage: you can insert the internal condom well before sex starts, so there’s no need to pause in the moment. This makes it feel more spontaneous for couples who find stopping to put on an external condom disruptive.
Removing It Safely
After sex, twist the outer ring a few times before pulling the condom out. Twisting seals the open end and keeps semen from spilling. Pull it out gently, wrap it in the packaging or tissue, and throw it in the trash. Internal condoms are single-use and should never be reused or flushed.
How Effective They Are
With perfect use every time, internal condoms have a 5% failure rate for pregnancy prevention. In real-world, typical use, that number rises to 21%, meaning roughly 1 in 5 people using them as their only method will become pregnant within a year. The gap between those numbers comes down to inconsistent use, incorrect insertion, or the condom shifting during sex. Practicing insertion a few times before relying on it helps close that gap.
For comparison, external condoms have a typical-use failure rate of about 13%. The higher typical-use number for internal condoms likely reflects the fact that fewer people use them regularly, so there’s a steeper learning curve.
Advantages Over External Condoms
Internal condoms solve several problems that make external condoms a poor fit for some people:
- Latex allergies. Because they’re made from nitrile rather than latex, internal condoms are completely hypoallergenic and won’t irritate sensitive skin.
- Lubricant flexibility. Nitrile is compatible with both water-based and oil-based lubricants. Latex external condoms break down with oil-based products, but internal condoms don’t have that limitation.
- Comfort for a partner. The pouch is roomier than an external condom, so it doesn’t fit tightly around the penis. Some couples find this feels more natural.
- Wearer control. If a partner is unwilling to wear a condom, the internal condom lets you protect yourself independently.
Important Things to Avoid
Never use an internal condom and an external condom at the same time. Doubling up creates friction between the two layers, which increases the chance that one or both will tear. Use one or the other, not both.
Internal condoms come in one size designed to fit most vaginal canals, so there’s no need to worry about finding the right fit the way you would with external condoms. They’re pre-lubricated with silicone-based lubricant, but adding extra lube inside the pouch or around the outer ring can make insertion easier and reduce noise during use, which is one of the more common complaints.
Internal condoms can also be used for anal sex. The insertion process is similar: the inner ring goes inside the anus while the outer ring stays outside. Remove the inner ring first if that’s more comfortable, then insert the pouch with a finger. The same rules apply: use only one condom at a time, use a new one for each act, and add lubricant generously.