I've Got You Under My Skin (series 1)

Piper: Don't put me in the middle.

Prue: I'm not. You were born in the middle.

The Painted World (series 2)

Dan: It's for a bio class, something with the human reproductive system.

Piper: You mean sex?

Dan: It's just too awkward for me to talk with my niece about.

Piper: Sure, not to worry I have plenty of experience.

Dan: Really! With sex.

Piper: No! I mean...talking about it. Yeh.

Siren Song (series 5)

Phoebe: Woman to woman, okay. Cole was the love of my life, and I'm finally learning to live without him. Calling him for a favor would open a can of worms that I've been trying to close.

Elise: Woman to woman. If you're still describing this guy as the love of your life, then the can is open, the worms are out, and you may as well use them to go fishing.