Oh, and I gather the procedure has changed a little from years past.
In the old days, they cut and excised a portion of the vas tie-ing up both ends. This meant that sperm was trapped in the shortened end of the vas. Sometimes, the sperm may not be cleared away by the immune system in time, before an infection set in - could cause problems - and it happened to a mate of mine

Pain, swelling, the whole "box and dice".
Nowadays, they only tie the "external end" of the cut pipe (cauterised and titanium clamp

), leaving the "internal end" open.
Basically means every time you ejaculate, you fill up your scrotum a little

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