Sandra: Uh-oh, hope I'm not interrupting anything. [rubs finger over back of hand]
Jonah: What is that?
Sandra: Sex.
Amy: No, it's not. I think you mean this.
[Amy and Jonah show an index finger going in and out of a thumb/index finger circle on the other hand]
Sandra: Oh, like this?
Jonah: Yeah, there you go.
Sandra: Oh...
[All three keep making the gesture]
Jonah: This is nice.