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External Condom vs Fertility Awareness

A side-by-side comparison of two birth control methods — efficacy, cost, how they work, and who shouldn't use them.

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Side-by-side comparison

  • External Condom A barrier method worn over the penis that also lowers the risk of STIs, available over the counter.
  • Fertility Awareness Tracking body signs like temperature and cervical mucus to identify fertile days and avoid unprotected sex then.
Method
External Condom A barrier method worn over the penis that also lowers the risk of STIs, available over the counter.
Fertility Awareness Tracking body signs like temperature and cervical mucus to identify fertile days and avoid unprotected sex then.
EfficacyExternal Condom 87% typical use

Least effective: under 90 out of 100 people successfully prevent pregnancy per year.

Fertility Awareness Least effective
CostExternal Condom $0–$2 per unit Insurance: VariesFertility Awareness $0–$20 Insurance: Varies
DurationExternal Condom Single useFertility Awareness Ongoing daily tracking
ReversibilityExternal Condom ReversibleFertility Awareness Reversible
STI protectionExternal Condom YesFertility Awareness No
How it worksExternal Condom

A sheath worn over the penis that keeps sperm from entering a partner's body. Latex and plastic condoms also block contact with semen and vaginal fluids that can carry STIs.

Fertility Awareness

Track basal body temperature, cervical mucus, and cycle length to identify the fertile window. Avoid unprotected sex or use backup contraception on fertile days.

PrescriptionExternal Condom Not required Over-the-CounterFertility Awareness Not required Self-Directed
Side effectsExternal Condom
  • Allergic reaction to latex in people with a latex allergy
Fertility Awareness None reported
Who shouldn't use thisExternal Condom
  • Known allergy to latex (use polyisoprene or polyurethane instead)
Fertility Awareness
  • Irregular cycles that make fertile window prediction unreliable
  • Inability to track consistently
  • Recent childbirth, breastfeeding, or perimenopause (cycles unstable)

Key differences

How long it lasts: External Condom, single use; Fertility Awareness, ongoing daily tracking. STI protection: only with External Condom. External Condom: costs $0–$2 per unit. Fertility Awareness: costs $0–$20.