Really any of his lines from War is The H Word or Amazon Women in the Mood.

We have failed to uphold Brannigan's Law. However I did make it with a hot alien babe. And in the end, is that not what man has dreamt of since first he looked up at the stars? [pause] Kif, I'm asking you a question.

If I said you had a beautiful body, would you take of your pants and dance around a little?

She's built like a steakhouse but handles like a bistro

Kiff, inform the men! I've made it with a woman.