It's Thursday. The husband leaves for work, the wife goes on with her day. The doorbell rings. When she opens the door, a man asks "Do you have a vagina?". Disturbed, she slams the door and goes on with her day. When her husband comes home, she tells him. "Oh, just some freak" is the husband's comment.
On Friday, the same thing happens. When the husband comes home, the wife is all up in arms. So the husband tells her tomorrow, if the man comes again, he'll hide behind the door and you tell that weirdo "Yes, I have a vagina".
Saturday, the bell rings. The husband hides behind the door and when his wife opens the door, there's the weirdo again. So she answers: "Yes, I have a vagina"...
The weirdo replies: "Would you please tell your husband to stop using my wife's vagina and use yours"...