1) would treat her nicely
2) wouldn't run away from her,
3) would be good in bed.
Three weeks passed, and there was no reply from any man. So she just figured that there wasn't a man alive who could live up to these expectations, so she just gave up.
Then, one day she heard the doorbell ring. She answered it, and there on the front porch was a man in a wheel chair who didn't have any arms or legs.
The man said "I'm here about the ad you put in the paper."
"What ad," she said having almost forgotten what she had even asked for.
"The personal ad," he replied. "As you can see, I have no arms so I can't beat you, and I have no legs so I can't run away from you." The woman replied, "Yes, but are you good in bed?" And the man said with a grin on his face, "I rang the door bell didn't I?