A man goes into hospital for a vasectomy.

When he wakes up he's surrounded by several anxious looking doctors and asks nervously "Is there a problem?"

The head surgeon says gently, with tears in his eyes "I'm afraid so...

I'm sorry but your notes got mixed up and we've given you a sex change rather than a vasectomy".

The patient is devastated and shockingly replies "Do you mean to say I'll never experience another erection...?"

The surgeon pauses for a moment then says "Well, you might, but it won't be yours"