NO!!!...NOT AT ALL.
It's Leela at Zapp.
Hmm the funny thing is I remember she has slept with him then find out he is jerk later.
However since I only seen that episode once I could remember it wrong. And the tape I used to tape all my futurama episodes had a problem. It got stuck on my VCR once and has been damaged.
OK, if she did discovered Zapp is a jerk after. Hmm... well as she is lonely and Zapp has his way to charm ladies, she could have done it out of mistakes. All human make mistakes, especially a women who is desperate in search of the love of her life. This kind of women is even more vulnerable.
So the conclusion is Leela is not a bitch for having high standards. Having high standards does not mean being perfect and never make mistakes. All human make mistakes, even the smart ones.