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When condoms actually increase the likelihood of pregnancy: Wait, what?!

posted on February 6, 2016 by Molly Daley Molly Daley

February is National Condom Health month. Some people are going to use this opportunity to passionately advocate for condoms, while others may actually use it to vehemently oppose them. Among those who promote fertility awareness based methods (FABM) of family planning and the body literacy that comes with them, opinion is split on the topic of condoms. I am simply going to use this opportunity to highlight one little-known (and pretty remarkable) fact: there are times when using a condom actually increases the likelihood of pregnancy.  Hang in there—please let me explain!

Condom effectiveness Fertility awareness

Photo courtesy of Paul Bence http://bit.ly/1Kycfhz

A counterintuitive concept

The title of this article seems like a joke, doesn’t it? As we all know, condoms are a form of birth control. Although they are relatively ineffective (the CDC reports only an 82% effectiveness rate[1]), and don’t prevent nearly as many diseases as one may think[2], condoms can still prevent pregnancy more often than not. If a woman happens to be fertile on a given day, condoms can lessen the likelihood of pregnancy. Condoms also are free of the health risks associated with any form of hormonal birth control or risks related to other birth control devices like IUDs or Essure. As a result, some people choose to “supplement” a fertility awareness-based method (FABM) with condoms. Since condoms are another method of preventing pregnancy, wouldn’t it make sense that using condoms in addition to an FABM would exponentially decrease your likelihood of achieving pregnancy? (i.e. by adding an additional layer of protection so to speak? No pun intended…)

When condoms don’t work the way you intend

Although it may be counterintuitive, using condoms with FABMs actually reduces the FABM’s effectiveness rate. Couples who use FABMs know when the woman is going through the fertile part of her cycle and can avoid pregnancy by abstaining during that time. Some of these couples choose to use condoms (or another barrier method), however, during fertile times. The one benefit these couples gain over those using condoms all the time is that when the woman is not fertile, they get to pass on the condom. However, their rate of success in avoiding pregnancy is, at best, only as good as that of the condom: 82%. In this case, your success rate is only as good as that of the worst method you are using, like a chain with one weak link.

When couples using an FABM choose to have intercourse with a condom during the woman’s fertile time, they are having sex with a far less effective family planning method at the one and only time in the woman’s cycle when she could get pregnant. During that period, any intercourse has a high risk; any failure of the condom will most likely result in pregnancy. FABMs’ impressive effectiveness rates (up to 99%!) are wholly thanks to abstinence during the fertile times. When you combine an FABM with a barrier method, you are stuck with the barrier method’s low effectiveness rate. You completely lose the effectiveness of the FABM.

“Because the fertile phase is the only time in the cycle in which you can possibly get pregnant, this is the time when abstinence is necessary if you’re determined to avoid a pregnancy,” writes Toni Weschler in Taking Charge of Your Fertility. “If a condom is going to fail, this is the time it would really matter!”

Ditching condoms

Couples who say goodbye to condoms may experience other benefits as well. Semen contains mineral zinc, as well as ascorbic acid, blood-group antigens, calcium, chlorine, cholesterol, choline, citric acid, creatine, fructose, glutathione, lactic acid, magnesium, nitrogen, phosphorous, potassium, sodium, sorbitol, and vitamin B12 — all of which are beneficial to a woman’s reproductive health.[4]

The benefits of semen also extend beyond the physical. First, semen contains many mood-elevating compounds such as endorphins, estrone, prolactin, oxytocin, thyrotrpin-releasing hormone, and serotonin.[5] Second, it is full of prostaglandins that bond the couple to each other.[6]

At the end of the day, it’s important to be as informed as possible about the family planning method you choose. Sometimes it’s hard to navigate your way through all the condom propaganda, whether it’s pro-condom or anti-condom. Stick to learning the facts—you deserve it. You don’t want to put yourself in a situation where the condom you use does the exact opposite of what you are hoping it will do!


[2] http://www.menshealth.com/sex-women/std-diagnostic-guide

[3] Taking Charge of Your Fertility, 176

[4] Cite

[5] https://www.psychologytoday.com/blog/all-about-sex/201101/attention-ladies-semen-is-antidepressant

[6] Cite

[7] Gallup G, Burch R, Platek S. Does semen have antidepressant properties? Archives Behavior

[8] Gallup G, Burch R, Platek S. Does semen have antidepressant properties? Archives Behavior

Posted by Molly Daley Molly Daley
Molly Marie Daley received her bachelors degree in Religious Studies and Arabic from The College of William and Mary, and holds a Juris Doctor from The University of Maryland School of Law. A few short weeks before the bar exam, she decided to forego a traditional law career in exchange for an adventure in promoting fertility awareness and natural family planning. She lives in the San Francisco Bay Area with her very patient husband Nick.

6 Responses to When condoms actually increase the likelihood of pregnancy: Wait, what?!

  1. Avatar Francoise Farron says:

    This is to make you aware of a revolutionary birth control method that has been on the market for almost two years without anyone getting pregnant! it is Smart Women’s Choice, a vaginal gel that contains no hormones and no germicides. It works by completely immobilizing the entire ejaculate. Learn all about it on

    • Avatar disqus_HXPuP9E9zS says:

      Hi Françoise,

      What happens if it does not cause full immobilization but allows a damaged spermatozoan to fertilize the egg? Will there be an elevated risk of birth defects?

      • Avatar Francoise Farron says:

        SWC does not damage spermatozoa, it completely immobilizes them.
        Completely. Microscopic examination shows that there is not one sperm present as a single particle. All are present in clumps of 20-50.

  2. Avatar Fiona Fox says:

    “Additionally, FABM couples who use condoms during the fertile time are
    more likely to experience condom malfunctions. When a woman is fertile,
    she produces a cervical mucus. This slippery substance increases the
    risk of the condom becoming dislodged, thus rendering the condom

    This is not accurate! TCOYF fertility is saying the barrier methods which sit OVER the cervix (diaphragm, cervical cap ect) are more likely to become dislodged during the fertile window due to increased cervical fluid. This does not not include condoms. Further more, it is recommended to use extra lubricants when using condoms to reducing the risk of the condom tearing. This is potentially harmful and misleading information that needs editing.

  3. Avatar Fiona Fox says:

    since you produce slippery cervical fluid doing you’re fertile phase,
    any barrier that SITS OVER the cervix could get dislodged more easily.”
    TCOYF pg 176. This would not include condoms. I whole hardheartedly agree that using any barrier in your fertile window increases risk. I also agree the are MANY merits and benefits to using abstinence in the fertile window – but we need to keep information factual about the alternatives.

    • Molly Daley Molly Daley says:

      Thanks for your feedback! We have made some changes to reflect your helpful feedback. Please check it out 🙂