Short answer: Yes — if the NuvaRing is being used correctly and both partners are confident there is no STI risk, you can have vaginal sex without a condom and have good protection against pregnancy. However, the NuvaRing does NOT protect against sexually transmitted infections (STIs), so condoms are still needed for STI protection (or if you or your partner have other partners or unknown STI status).

How the NuvaRing works (quick):

  • The NuvaRing is a small flexible ring inserted into the vagina that releases combined estrogen and progestin hormones to prevent ovulation and thicken cervical mucus.
  • Typical use pregnancy rate for combined hormonal methods (including the ring) is about 7% per year; perfect use pregnancy rate is about 0.3% per year. The ring’s effectiveness is very good when used correctly.

What "used correctly" means (key points):

  • Insert one new ring and keep it in place for 3 weeks (21 days).
  • Remove the ring for 1 ring-free week (7 days), during which you usually get a withdrawal bleed. After day 7, insert a new ring even if bleeding hasn’t finished.
  • If you start the ring for the first time (or after a break), you generally need to use backup protection (like condoms) for the first 7 days unless started at the correct point in your cycle as instructed by the clinician.

Important rules about the ring coming out:

  • If the ring is out for less than 3 hours: rinse with lukewarm water and reinsert. No backup needed.
  • If the ring is out for more than 3 hours during weeks 1 or 2: rinse and reinsert, and use backup contraception (condoms) for 7 days. Consider emergency contraception if you had unprotected sex during the time the ring was out and you’re within the window for emergency options.
  • If the ring is out for more than 3 hours during week 3: follow the manufacturer instructions (usually discard the ring and either insert a new ring immediately and start a new 3‑week cycle or have a 7‑day ring‑free interval). Use backup for 7 days if you don’t insert a new ring right away.

When to consider emergency contraception:

  • If the ring was out for >3 hours and you had unprotected sex during the time when the ring should have been providing contraception, emergency contraception may be appropriate. Options and time windows differ (levonorgestrel pill up to 72 hours, ulipristal up to 120 hours, copper IUD up to 5 days) — contact a clinician or clinic promptly.

Medications and other factors that can reduce effectiveness:

  • Certain medicines that increase liver enzymes (rifampin/rifabutin, some anticonvulsants like carbamazepine, phenytoin, phenobarbital, and herbal St. John's wort) can lower hormone levels and reduce ring effectiveness.
  • Obesity may modestly reduce effectiveness of combined hormonal methods in some studies; discuss this with a clinician if relevant.
  • Severe vomiting/diarrhea affect pills but are not directly relevant to a vaginal ring; however, if you have concerns about absorption or interactions, check with a clinician.

STI protection and testing:

  • The NuvaRing prevents pregnancy but does not prevent STIs (including HIV). If either partner has other sexual partners or unknown STI status, use condoms for STI protection.
  • If you plan to stop using condoms because of trust in a partner’s ring use, consider getting tested for common STIs (chlamydia, gonorrhea, HIV, syphilis) first and discuss a testing schedule with a clinician.

Practical checklist before you stop using condoms:

  • Is the ring inserted correctly and in the correct cycle week? (If recently started, has the 7‑day protection period passed?)
  • Has the ring been in continuously (not out longer than 3 hours) during the current cycle?
  • No current or recent meds that reduce hormonal contraception effectiveness?
  • Are both partners monogamous and have been tested/cleared for STIs, or are you willing to accept STI risk?

When to contact a clinician:

  • Any concern the ring was out for >3 hours and you had unprotected sex (ask about emergency contraception).
  • Starting a medication that might interact with the ring.
  • Severe side effects (severe headache, chest pain, shortness of breath, leg pain/swelling, sudden vision problems) — these can be signs of rare but serious complications and need urgent care.
  • Questions about obesity, weight and effectiveness, or desire for a different contraceptive method.

Bottom line: For pregnancy prevention, the NuvaRing works well when used correctly, so many couples choose to have vaginal sex without a condom. But the ring does not protect against STIs — use condoms if STI protection is needed. If there’s any doubt about correct use, recent ring removal, or interacting medicines, use a condom as backup and contact a clinician for personalized advice.

If you want, tell me: when was the ring inserted or last removed, and whether you or your partner are using any other medicines? I can give a more specific recommendation.