Sara Ramirez, Jessica Capshaw

Last week on Grey's Anatomy, Alex (Justin Chambers) and Lexie (Chyler Leigh) got busy, and we finally got a glimpse into Callie (Sara Ramirez) and Arizona's sex life. If you thought last week's brief shower scene was hot, there's more to come, Jessica Capshaw, who plays Arizona, told TVGuide.com.

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While Callie is recovering from chicken pox this week, "We see a little girl-on-girl action," said Capshaw, who added that it was nice to see the build-up of the relationship first before jumping into "salacious" make-out sessions.

Characterizing Callie and Arizona's relationship as "solid," Capshaw said: "When they have issues, they communicate. They have fights, but they're there for one another. Clearly it wouldn't be a one-hour drama if there wasn't some conflict around the corner, so I'm sure there will be challenges soon, but right now they're riding the little wave of being happy."

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Callie and Arizona may be secure, but Alex and Izzie (Katherine Heigl) are about to head down a path of destruction. "Maybe the big D's going to happen," Chambers said. The big D, of course, stands for divorce. "I think he'll always have something in his heart for Izzie. I know that even when they divorce, if they divorce ... he loves her very much."

Alex's surprising hook-up with Lexie last week probably hindered any chance of a healthy marriage with Izzie, but that doesn't mean he's going to start up a relationship with Lexie now. "All these characters have slept together, so he was just rebounding. It was more or less a one night stand. I don't think there's going to be a relationship there. He's still pining for Izzie."

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And if you think Alex will just jump from woman to woman at Seattle Grace, don't fret: Yang (Sandra Oh) and Grey (Ellen Pompeo) are definitely off-limits. "Those are like my sisters, especially Grey. ... That would be a twist if that happened. If the ratings start to slip, maybe they'll do that," joked Chambers.

Who is your favorite couple on Grey's Anatomy?