Breathe safe, my friend, vasectomy, and impotence are worlds apart.
Vasectomy is a procedure that closes or blocks the tubes that carry sperm in men, ensuring that it cannot leave a man’s body and cause pregnancy. A man’s sexual drive, on the other hand, remains intact. So your erections and ability to climax stay safe, the only difference is that the orgasm will not have sperm.
Also, do note that vasectomy won’t prevent any STIs and it will take about three months or 20 ejaculates before the penis is sperm-free.