the Risks of Unprotected Sex with IUDs - Obstetrics and Gynecology

Intrauterine drug delivery system

If your girlfriend has been using the Mirena IUD for four months, it is generally considered to be a highly effective form of contraception.
The Mirena IUD works by releasing hormones that prevent ovulation and thicken cervical mucus, making it difficult for sperm to reach an egg.

During the ovulation period, the risk of pregnancy is higher if no protection is used.
However, since the Mirena IUD is over 99% effective at preventing pregnancy, the chances of her becoming pregnant while using it correctly are very low, even during her fertile window.

It's important to ensure that the IUD is properly placed and that she follows up with her healthcare provider for regular check-ups.
If there are any concerns about its effectiveness or if she experiences any unusual symptoms, it is advisable to consult a healthcare professional.

Jk, 20~29 year old female. Ask Date: 2017/03/18

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, the chances of pregnancy are low, so you can rest assured.
Wishing you good health.

Reply Date: 2017/03/18

More Info

When it comes to understanding the risks associated with unprotected sex, particularly in the context of a partner using an intrauterine device (IUD) like Mirena, it's essential to consider both pregnancy and sexually transmitted infections (STIs).

First, let's address the pregnancy risk. The Mirena IUD is a highly effective form of contraception, with a failure rate of less than 1% when used correctly. This means that if your girlfriend has had the Mirena IUD in place for four months, and it is properly positioned, the likelihood of her becoming pregnant is very low, even during her ovulation period. The IUD works primarily by releasing hormones that prevent ovulation, thicken cervical mucus to block sperm, and thin the uterine lining to prevent implantation. Therefore, if she has been using it consistently and it has not been expelled or dislodged, the risk of pregnancy from unprotected intercourse is minimal.

However, it is crucial to note that while the IUD is effective at preventing pregnancy, it does not protect against STIs. Engaging in unprotected sex increases the risk of contracting or transmitting STIs, including HIV, chlamydia, gonorrhea, and others. If either partner has had previous sexual partners or if there is any uncertainty regarding STI status, it is advisable to use condoms to reduce this risk.
In terms of timing, while the IUD is effective at preventing pregnancy, the risk of STIs remains constant regardless of the menstrual cycle. Therefore, even during the "dangerous" ovulation period, the use of an IUD does not mitigate the risk of STIs.
If you and your girlfriend are considering continuing unprotected sex, it may be beneficial to have an open discussion about sexual health, including STI testing. Regular screenings can provide peace of mind and ensure that both partners are healthy.
In summary, while the Mirena IUD significantly reduces the risk of pregnancy, it does not eliminate the risk of STIs. If you are concerned about either pregnancy or STIs, it is wise to consult with a healthcare provider for personalized advice and to consider using condoms as a dual protection method. Regular communication with your partner about sexual health and safety is key to maintaining a healthy relationship.

Similar Q&A

Understanding Risks of Unprotected Anal Sex: A Urology Perspective

I had unprotected anal sex yesterday with someone who claimed he had only done it a few times. I was the insertive partner, and I usually use condoms during encounters, but for some reason, I didn't use one yesterday. The receptive partner asked why I was willing to have unp...

Dr. Li Xinyi reply Urology
Adequate lubrication is essential during sexual activity to prevent injuries that can lead to infections, especially during anal intercourse, as it involves a higher presence of bacteria. If engaging in risky sexual behaviors, it is important to promptly consult a urologist or an...

Understanding Pregnancy Risks After Unprotected Anal Intercourse

Engaging in anal intercourse carries a lower risk of pregnancy compared to vaginal intercourse, as sperm must enter the vaginal canal to result in pregnancy. However, if semen comes into contact with the vaginal opening, there is still a potential risk, albeit lower. The presence...

Dr. Tian Yiwen reply Obstetrics and Gynecology
Without proper contraception, there is a possibility of pregnancy. If menstruation is delayed for more than two weeks, it is advisable to take a home pregnancy test. The elasticity of the anus is not as good as that of the vagina, making it easier to sustain injuries during sexua...

Understanding the Health Risks of Unprotected Anal Sex

Hello doctor, my girlfriend and I are both "virgins." I would like to ask if engaging in "unprotected anal intercourse" means we won't contract sexually transmitted infections (STIs), or are there other health risks involved?

Dr. Du Shixi reply Urology
Hello: It is not recommended, as there is a possibility of injury to the anal sphincter or infection issues. Although there is no risk of sexually transmitted infections, caution is still advised.

Understanding STDs: Risks of Unprotected Sex and Safe Practices

I don't understand how having sex without a condom doesn't increase the risk of sexually transmitted infections (STIs). Is it because both partners' genital areas are not clean, or is there another reason? Also, when having a baby, couples usually don't use co...

Dr. Du Shixi reply Urology
Engaging in unprotected sexual intercourse carries the risk of sexually transmitted infections (STIs) for both partners. If either partner has an STI, it can be transmitted to the other during unprotected sex, making the choice of sexual partners very important. Of course, when t...