Booth: So, what do you think? Man or woman?
Brennan: I am uncomfortable defining sex with just a skull, but
Booth: Come on. Take a stab. I won't write anything down, I promise. It's between me and you.
(Brennan looks at Hodgins.)
Hodgins: What? You don't want to take a stab in front of me?
Brennan: I feel inhibited by my desire not to embarrass myself in front of another scientist.
Booth: You should take that as a compliment.
Hodgins: What about him?
Brennan: Well, we live together, and thus share the same synergistic lack of inhibition, which allows us to have sex without being self-conscious.
Booth: That's very romantic, Bones.