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."