Fertility Awareness
vs
Vasectomy

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

Side-by-side comparison

Method
Fertility Awareness

Fertility Awareness

Tracking body signs like temperature and cervical mucus to identify fertile days and avoid unprotected sex then.
Vasectomy

Vasectomy

A permanent outpatient procedure that blocks the vas deferens so sperm cannot enter the semen.
EfficacyLeast effective see details

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

99.85% typical use

Most effective: over 99 out of 100 people successfully prevent pregnancy per year.

Cost$0–$100 /monthly

Insurance: Varies

$0–$3,500

Insurance: Usually

DurationOngoing daily trackingPermanent
ReversibilityReversiblePermanent
STI ProtectionNoNo
How it works

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

A clinician cuts, seals, or blocks the vas deferens so sperm cannot mix with semen during ejaculation. The body absorbs the sperm, and the semen remains normal in appearance and volume.

PrescriptionOTC No prescription / OTCOTC Procedure (in-person)
Available Products4 productsNo branded products yet
Side effectsNone reported
  • Mild pain or swelling for a few days
  • Bruising or bleeding at the site
  • Sperm granuloma (small lump, usually harmless)
  • Chronic post-vasectomy pain syndrome (rare, 1-2%)
Who shouldn't use this
  • Irregular cycles that make fertile window prediction unreliable
  • Inability to track consistently
  • Recent childbirth, breastfeeding, or perimenopause (cycles unstable)
  • Uncertainty about future fertility desires
  • Active local or systemic infection
  • Bleeding disorder