On-screen couple Lea Michele and Cory Monteith talk about real-life "Glee" hookups!

Talking to Teen Vogue, the two address the obvious: Who's getting together behind the scenes?

"Oh, we've all gotten down and dirty," Lea jokes. "It's like, nasty. We can't keep our hands off each other ... no, I hate to be boring, but we're just friends. I think Mark [Salling, who plays Puck] and Naya [Rivera, who plays Santana] dated for a little while..."

"Yes," Corey adds cryptically, "the key incident."

"And now it's the key incident," Lea confirms, without adding details. "I have no idea. All I have to say is that it was nice when they were together."

As far as their own canoodling -- in character -- it's strictly business. "My boyfriend [American Idiot star Theo Stockman] is an actor as well," Lea says. "So he understands."

The "Glee" issue of Teen Vogue is out November 23.

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