About 6% of men who undergo vasectomy seek reversal or self-report regret in long-term follow-up, according to a 2022 review of the urology literature (PMC9476225). Individual study estimates range from 2.2% (Galano et al. 2023, single-centre retrospective, n=274) to 7.4% (childless men at telephone follow-up). Reversal-seeking almost certainly underestimates true regret: the procedure costs $3,000-15,000 out of pocket and success rates decline with time elapsed, meaning a man who regrets his vasectomy at year 10 may not appear in reversal statistics. On the inaction side, no published survey directly measures regret among men who chose not to get a vasectomy. The 4% inaction proxy is constructed from the contraceptive-burden literature: in a French survey of vasectomised men, about three-quarters (76%) cited relieving their partner’s contraceptive burden as the main motivation, suggesting that men who did not act may carry latent awareness of the asymmetry — though this is a proximal motivation measure, not a regret measure.
Age is the dominant moderator on the action side and accounts for most of the clinical concern about vasectomy regret. Men vasectomised before age 30 are approximately 12.5 times more likely to seek reversal than those who wait until their 30s. The most common precipitant of regret across studies is a change in partner — remarriage after divorce, or the death of a child — rather than a change of mind about having children in a stable relationship. This means the aggregate 6% rate masks a much higher rate among young men who act before life circumstances have stabilised — consistent with the 12.5-times-higher reversal-seeking rate cited above — and a substantially lower rate among men in their 30s and 40s with completed families.
The balanced classification reflects the overall population rather than any particular subgroup. Gilovich and Medvec’s typical finding — inaction regret dominates in the long run — is consistent with vasectomy as a category: the option to act remains open at any time before the procedure is taken, which dampens inaction regret. But the action side has measurable regret with a known mechanism (age-related life-circumstance change), and the inaction side lacks any direct measurement. Both rates carry substantial uncertainty, and the delta (0.02) should be read as roughly balanced, not as a precise quantitative claim.