Bernadette, Penny and others in “The Propagation Proposition”

Bernadette

So Leonard's really considering this?

Penny

Yes. We got in a huge fight about it. He said, well, if I don't want to have his baby, then why shouldn't someone else be able to? Do you believe that? What?

Bernadette

Well, there is a deep-seated biological drive to pass on your genes. It's only natural.

Penny

So you're on his side?

Amy

Well, viewing Leonard as a mammal, it's perfectly understandable.

Bernadette

But viewing him as your husband, he stinks.

Amy

And we hate him.