Bones, Season 9

Brennan:
You know I would never sleep with him.

Booth:
Well, you know what? You did tell me once that you thought that monogamy was unnatural.

Brennan:
Yes, that's true. Before I realized that we were symbiotic. Like a clown fish and a sea anemone.

Booth:
[dismayed] What? What are you talking about, Nemo? That doesn't sound very romantic.

Brennan:
I disagree. You and I, we're bound to one another. So much so that I don't feel that I could survive without you. You nurture me. You protect me. You are my home. If I were to damage that by a meaningless dalliance, it would be like killing myself. Something that I would never do.

Booth:
That sounded a little better.

Brennan:
I would never let anything compromise the life we share, Booth. I love you.

Booth:
Okay, now that's romantic. I love you too.