Actress Amanda Seyfried poses for a photo as she promotes her new film "Chloe" at the Toronto International Film Festival on Sunday September 13, 2009. THE CANADIAN PRESS/Chris Young

TORONTO - To hear Amanda Seyfried tell it, what you do with your tongue in Hollywood depends on your generation.

The 23-year-old star of Atom Egoyan's new film "Chloe" said she had to learn that older actors draw the intimacy line at having a co-star's tongues in their mouths.

"A lot of us in the younger generation, the people that I've worked with, haven't got the memo about the tongue issue," Seyfried said Sunday during an interview promoting "Chloe" at the Toronto International Film Festival.

"It's still very awkward kissing your co-worker, it's just not natural, but there's a lot of tongue involved in the younger generation when I make out with my co-stars."

Seyfried - who also starred in "Mamma Mia" - can be seen kissing two fellow actors onscreen at the festival: Julianne Moore in "Chloe" and Megan Fox in "Jennifer's Body."

While the tongue apparently wasn't an issue with Fox, Seyfried said she has discussed the issue with both Moore and Jeanne Tripplehorn, her co-star on the HBO show "Big Love," who are both in their 40s.

"There are way different boundaries with that generation. It was a big education on that."

Seyfried, dressed in silver short shorts with matching silver high heels, a V-neck T-shirt and a dark blazer, snacked on a bowl of fresh berries while gamely discussing the kissing issue.

The Allentown, Penn., native said "there's a certain intimacy boundary in a professional setting" among the older generation.

"We do what's natural to us," she said of young actors using the tongue.

"But it's not needed apparently."