Bones, Season 4

Sweets:
Um...Can I offer you a piece of advice?

Booth:
Well, that's why we called you, Sweets...

Sweets:
Don't try too hard to be their friends. Act like you're more interested in each other than any of them, all right? They will come to you.

Brennan:
Okay, thanks, Sweets. [she hangs up]

Booth:
So, uh, sex, right?

Brennan:
Uh, good idea.

Booth:
'Kay.

[they start to shake the trailer]

Brennan:
Okay, well I think what we need to do is get a syncopated rhythm going, that takes advantage of the natural frequency of the springs...

Booth:
Whoa, whoa, whoa, wait a minute, are you this spontaneous during real sex?

Brennan:
Yes, I am.