A man takes his wife to the State Fair, one of the exhibits is that of breeding bulls. 

They come up to the first pen and there is a sign that says “This bull mated 50 times last year.” 
  
The wife pokes her husband in the ribs and says, “He mated 50 times last year.” 
  
They walked a little farther and see another pen with a sign that says, “This bull mated 120 times last year.” 
  
The wife hits her husband and says “That’s more than twice a week! You could learn alot from him.” 
  
They walk farther and a third pen has a bull with a sign saying, “This Bull mated 365 times last year.” 
  
The wife gets really excited and says “That’s once a day!” You could REALLY learn something from this one.”
  
The husband looks at her and says “Go up and ask him if it was with the same cow.”