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Jennifer Garner, Hugh Jackman

INFphoto.com; Jon Kopaloff/FilmMagic

You'd think filming a sex scene with superhunk Hugh Jackman would be a piece of beefcake.

Not so for Jennifer Garner.

The baby-bumpin' actress tells us having to get hot and heavy with the Aussie actor was—believe it or not—"horrifying!"

While filming their new indie flick Butter, Garner and Jackman had to record an off-camera sex scene in which both actors had to vocalize the sounds of their character's lovemaking.

"Of course, it was like the first day we worked together," Garner told us at last night's AFI Festival premiere of the film in Hollywood. "It's always like that. It's always like, 'It's nice to meet you, now let's moan and groan.'"

"I'm such a huge fan of his," she laughed. "It was so horrifying."

As for the ongoing speculation that Garner's character in the dark political comedy is strikingly similar to conservative Republican figures Sarah Palin and Michele Bachmann, she said, "I didn't look at the political figures of today at all. As far as the political stuff, that you'll just have to read into yourself."