The following are true related with regards to vasectomy except

Vasectomy consists of dividing and excising a part of vas deferens (with spermatic cord). It leads to permanently ending fertility fo men. Failure rate 0.15%. The sterility does not occur immediately after vasectomy. Sperms remain in semen for 15–20 ejaculations which is approximately 3–4 months, during which time an additional contraceptive method (condom by male or DMPA by wife should be used).