Most Dr.s will never tell you that around 15% or more of men getting vasectomies will have different problems and pain. A very small percentage of men will have a very severe reaction to this surgery and can even end up being fully castrated by their own immune system attacking their sperm and sperm producing cells inside their testicles. Once this begins, there is no cure or treatment and their own immune system literally eats their balls down to nothing left. Some men get far less damage but can have low testosterone at different amounts of time after a vasectomy from progressive damages from pent up sperm pressure, chronic pain, and immune system partial destruction of their testicle interiors. Think long and hard before you get your nut cords cut and blocked off. All that sperm needs to get out of your balls every day of your life somehow. Some people view vasectomies as a slow form of castration for a lot of men years later. Men with large testicles and high sperm counts seem to be the most likely to have the more severe bad reactions to vasectomies. Larger men seem more prone to problems too, likely because larger men also tend to have bigger nuts too. Condoms are a pain but they do save your balls.