Season 6, Episode 4: "The Chinese Woman"

You never slipped one past the goalie in all these years?

I'm surprised. You've slept with a lot of women.

A lot of women!

Do you think maybe I'm...

Well, I'm sure you're not totally depleted.

But what if I am? I'm the last male Kramer.

We're facing extinction.

Go to a fertility clinic, check your sperm count.