An exclusive clip from the Oct. 3 episode of Grey's Anatomy, titled Everybody's Crying Mercy, shows Cristina Yang and Alex Karev in bed together talking about a topic that makes the latter pretty uncomfortable.

The video shows Cristina (Sandra Oh) early in the morning walking into the living room of a home and seeing all the interns -- including Alex's girlfriend, Jo (Camilla Luddington) -- asleep on the floor. She then walks into Alex's bedroom and gets into bed with him, telling him she cannot fall asleep. He insists she call her ex-boyfriend Owen Hunt (Kevin McKidd) or "try the Internet like everybody else for dating. Find somebody else to get horny with."

Cristina then asks why Jo is not sleeping with Alex (Justin Chambers) and is instead passed out with the rest of the interns in another room.

"She's passed out with her friends -- again," Cristina begins. "Does she ever sleep with you?"

When Alex does not respond, she continues to say the following:

"Did you guys have sex and it was awful? Was she awful? (he responds "No") Where you awful? And now you're ashamed you can't even look at her? (Alex responds "No"). Or was it weird? Is she a man? Oh -- secret penis."

Alex tells her "shut up," as he is also trying to sleep, but Cristina will not stop.

"Well, why don't you guys ever sleep together?" she asks, to which Alex yells back, "We will."

The answer shocks Cristina and she says, "oh, you two haven't done it yet," but then Alex tries to convince her that they have in fact sleep together before. Cristina teases him more about them going public with their relationship for almost a week and still "haven't closed the deal."

Watch the complete clip below and see how the conversation ends.

Episode 3 of Grey's Anatomy airs Thursday, Oct. 3, on ABC at 9 p.m. ET.

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