The number of men in England having vasectomies has dropped by 63 percent in a decade, figures show.
Fears that relationships will not last are said to be partly behind the fall.
Budget cuts could also help explain the figures for National Health Service hospitals and sexual health clinics. They show 29,344 had the operation in 2005-06 but just 10,880 in 2015-16.
It should be available under the NHS, but some regions have restricted access to the procedure in a bid to save money.
And a spokeswoman for the British Pregnancy Advisory Service said: “The decline may also reflect social shifts.
“Couples are waiting longer to start and complete their families, and there may also be greater awareness that relationships can fail and that vasectomy is generally an irreversible choice.”
Family Planning Association boss Natika Halil added: “Some commissioners in England, in areas including Essex, are now no longer offering vasectomies on the NHS, which means men may have to pay up around £500 ($655) for a private procedure.”
But the rate of reduction is slowing down, with only a 2 percent decrease between 2014-15 and 2015-16.