Here are 10 surprising facts about contraception that will make you rethink everything you thought you knew about birth control, from how the pill can sway a woman’s mate preferences to the way reality TV has nudged teen pregnancy rates down.
10 Surprising Facts About Contraception
10 Pill Use May Influence A Woman’s Choice Of Sexual Partner
Research repeatedly shows that during ovulation, many women feel a stronger pull toward traditionally “masculine” traits—tall stature, broad shoulders, dominance, competitiveness, and high intelligence. Evolutionary biologists argue this bias evolved to steer women toward partners who could provide resources and protection.
Enter the oral contraceptive pill. With roughly 60 million women worldwide relying on it, the pill suppresses the hormonal surge that triggers ovulation, and the associated shift in attraction appears to vanish. A recent study in the Journal of Sexual Medicine concluded that pill‑using women generally do not experience the same spike in preference for masculine men during their cycle.
What does this mean for human evolution? Some speculate that the classic “man’s man” could gradually fade as more women on the pill pair with less traditionally masculine partners. Yet when women discontinue the pill to conceive, the attraction to masculine traits may flare up again. Even if the pool of hyper‑masculine men shrinks, evolution isn’t necessarily doomed—earlier UK research found that while pill‑users might favor less masculine men for a brief fling, they actually lean toward traditionally macho partners when seeking a long‑term relationship.
9 A Woman’s Sexual Satisfaction May Depend On How She Takes The Pill
Beyond mate selection, the pill can also influence relationship dynamics. A separate study examined how a woman’s pill status correlated with her overall satisfaction in long‑term partnerships.
When it came to non‑sexual aspects of the relationship, pill usage made no difference—whether a woman was on the pill or not, her satisfaction levels were virtually identical. However, sexual satisfaction told a different story. Women who remained consistently on the pill, or consistently off it, reported higher sexual contentment with their partners than women who started or stopped using the pill during the course of the relationship.
This suggests that switching contraceptive methods mid‑relationship could dampen sexual fulfillment. So, if you’re trying to rekindle the spark, you might consider swapping roses for a pack of birth‑control pills—just kidding, but the data certainly raises eyebrows.
8 Overweight Women Are More Likely To Experience Birth Control Failure
Among pill users, body‑mass index (BMI) appears to matter. Women with a BMI of at least 27.3 face a 60 % higher risk of an unintended pregnancy, while those with a BMI of 32.2 or above see that risk climb to roughly 70 %.
Recall that a BMI between 25 and 29.9 signals overweight status, and 30 or higher indicates obesity. While BMI is a handy, albeit imperfect, proxy for body fat—sometimes overstating fat in muscular individuals and understating it in older adults—it does highlight a concerning trend.
The exact mechanism remains unclear, but researchers hypothesize that higher body weight may boost metabolic rates, increase liver enzyme activity, and expand fat stores, all of which could shorten the pill’s effective window and dilute its concentration in the bloodstream.
7 Reality TV May Have Significantly Reduced Teen Pregnancies
While most critics argue that television fuels risky teen behavior, a pair of economists discovered a surprising upside to MTV’s reality series 16 and Pregnant and its spin‑off Teen Mom. By mining Google Trends, Twitter chatter, and official birth‑record data, they traced a noticeable dip in teen birth rates during the shows’ airtime.
Their analysis suggested a drop of up to 5.7 % in teen births between June 2009 and the end of 2010—roughly one‑third of the total decline observed in that period. Moreover, teen abortions also fell, indicating that the reduced birth count stemmed from fewer pregnancies rather than increased terminations.
If these findings hold, the shows may have performed a public‑health service by reshaping attitudes toward contraception and encouraging more responsible choices among at‑risk youth.
6 The Pill For Men
Scientists have chased a male birth‑control pill for decades, yet a testosterone‑based formulation that suppresses sperm while preserving libido has remained elusive. When testosterone levels are sufficient to maintain sexual function, sperm production typically rebounds.
Recent breakthroughs have shifted focus away from hormones toward a novel strategy: blocking two proteins in the smooth‑muscle cells that power sperm expulsion during ejaculation. In mouse models, disabling these proteins leaves sperm present but immobilized, effectively preventing fertilization without harming sperm quality or sexual performance.
Although promising, this approach is still years away from human trials. Expect a potential timeline of up to a decade before a market‑ready male contraceptive pill becomes a reality.
5 A Newer Female Sterilization Process Increases The Risk Of Pregnancy
Female sterilization is intended to be a permanent solution, and in the United States it stands as the most common method for women over 35. The traditional laparoscopic approach has long been the gold standard, but a newer hysteroscopic technique—often performed in a physician’s office—has gained traction.
Unfortunately, data over a ten‑year span reveal that hysteroscopic sterilization leaves women more than ten times as likely to experience an unintended pregnancy compared with laparoscopic sterilization. The procedure involves inserting tiny coils into the openings of the fallopian tubes, then requiring an additional three‑month period of alternative contraception while the tubes are confirmed blocked via dye and X‑ray imaging.
The heightened pregnancy risk is most pronounced during the first year after the procedure, primarily because the method only becomes effective after the three‑month waiting period. Some patients also miss follow‑up appointments, which are essential to verify successful tubal occlusion.
4 Teens Get Bad Information About The Morning‑After Pill From Pharmacists
The emergency contraceptive, commonly known as the morning‑after pill, is legally available without a prescription. Yet a study published in the Journal of Adolescent Health found that many 17‑year‑old teens encountered misinformation when trying to purchase it.
Researchers posed as teenagers and called 940 pharmacies across the United States. In numerous cases, pharmacy staff either outright denied access or gave inaccurate guidance about age requirements, despite the legal entitlement. Some employees cited personal or religious objections, while others insisted that a boyfriend could not fill the prescription for a teen or that a parent’s presence was mandatory.
The authors recommend that adolescents stock the morning‑after pill at home ahead of time, sidestepping the gatekeeping that can delay or prevent timely access.
3 A New Intravaginal Ring May Protect Against Pregnancy, Herpes, and HIV
A cutting‑edge intravaginal ring is poised for clinical testing, delivering a dual‑drug cocktail over a three‑month period. The device releases tenofovir—a potent antiretroviral that shields against HIV and herpes—alongside levonorgestrel, a low‑dose hormonal contraceptive that prevents pregnancy.
The ring measures roughly 5.5 cm (2.1 in) in diameter and stays comfortably inside the vagina for the entire three‑month span. Engineering this device was a feat: tenofovir is highly water‑soluble and required a 10 mg daily dose, whereas levonorgestrel is water‑insoluble and needed only 10 µg per day. The result is a seamless, low‑maintenance regimen that outperforms daily pills in adherence.
Unlike oral antiretrovirals, which demand higher doses and strict daily compliance, the ring offers a “set‑and‑forget” solution, simplifying protection against both unintended pregnancy and sexually transmitted infections.
2 Parents Of Teen Girls Mostly Prefer One Type Of Contraception
A University of California study surveyed parents about their preferred contraceptive methods for teenage daughters. The findings revealed a clear hierarchy of acceptance, beginning with birth‑control pills and descending through condoms, injectable hormones, the morning‑after pill, transdermal patches, implants, and finally intrauterine devices (IUDs).
Parental preferences were shaped by several factors: beliefs about the likelihood of their daughter being sexually active, personal parenting philosophies, knowledge of sexually transmitted infections, and the parents’ own teenage sexual experiences. Notably, parents who anticipated that their teen would be sexually active were more amenable to condoms and the emergency pill, while more religious parents tended to reject the morning‑after option.
Researchers expressed surprise that condoms—non‑invasive and protective against both pregnancy and STIs—were not the top choice, underscoring the complex interplay between cultural, moral, and practical considerations in family contraceptive decisions.
1 That Old Myth About Going Blind If You Have Sex May Be True After All
The American Academy of Ophthalmology recently reported that women who have taken oral contraceptives for three or more years face double the risk of developing glaucoma compared with non‑users.
The study tracked 3,400 women aged 40 and older across the United States. While researchers have yet to pinpoint the exact biological pathway, they suspect that estrogen influences intra‑ocular pressure, a known risk factor for glaucoma. Additional risk factors include age, family history, African ancestry, elevated eye pressure, diabetes, and hypertension.
Given these findings, the authors advise women with prolonged pill usage to schedule regular glaucoma screenings with an eye specialist, ensuring early detection and treatment if needed.