The Blonde Rancher's Wife

A blonde city girl named Jennifer marries an Idaho rancher. One morning, on his way out to check on the cows, the rancher says to Jennifer, 'The insemination man is coming over to impregnate one of our cows today, so I drove a nail into the 2 by 4 just above where the cow's stall is in the barn. Please show him where the cow is when he gets here, OK?'
The rancher leaves for the fields. After a while, the artificial insemination man arrives and knocks on the front door. Jennifer takes him down to the barn. They walk along the row of cows and when Jennifer sees the nail, she tells him, 'This is the one right here.' The man, assuming he is dealing with an air head blonde, asks, 'Tell me lady, 'cause I'm dying to know; how would YOU know that this is the right cow to be bred?'
'That's simple," she said. "By the nail that's over its stall,' she explains very confidently.
Laughing rudely at her, the man says, 'And what, pray tell, is the nail for?' The blonde turns to walk away and says sweetly over her shoulder,
'I guess it's to hang your pants on.'