A Vasectomy surgery is the safest form of contraception. If you want to have a comparison with other forms of contraception, the intrauterine device (coil) has a failure rate of about 1% and so does the contraceptive pill. The vasectomy failure is estimated to be 1 in 3 thousand. This is also much lower than the equivalent form of female sterilisation, which is the tubal ligation. If you are looking for a form of contraception which can guarantee you the lowest possibilities of accidents vasectomy is the logical choice.