Final answer:
A vasectomy is a surgical procedure that blocks the vas deferens, preventing sperm from being ejaculated. It does not affect testosterone production or volume of ejaculation.
Step-by-step explanation:
A vasectomy is a surgical sterilization procedure in which the vas deferens, the duct through which sperm travel, is blocked. This prevents sperm from being ejaculated and results in sterility. However, it does not affect the production of testosterone or the volume of ejaculation. It is recommended to use additional birth control methods until sperm count is confirmed to be zero, which typically takes several months after the procedure.