...to be funny.
Just so you know: The man is just a strong and tough but otherwise entirely ordinary dude. The chick is a virtually indestructible cyborg (they call her an android, but she was originally human, so she's a cyborg-THERE IS A DIFFERENCE, PEOPLE!!) who has essentially infinite endurance and could destroy the entire planet if she wanted.
I don't know, I guess she was just too embarrassed to go on. (Actually, I'm under the impression that most of the characters, who are all superhuman fighters, had been letting him win to be nice. Or something. ...I'm only passingly familiar with DBZ.)