Rachel McAdams says she's been kissing for nearly two decades but still worries she's doing it wrong.[Agencies]

It’s not easy making love in Hollywood - at least not in front of movie cameras. Just ask Kate Winslet and Rachel McAdams.

Actors Leonardo DiCaprio, 33, and Kate Winslet, 32, had a lovemaking scene in the upcoming drama Revolutionary Road, which was directed by Winslet’s husband, Sam Mendes.

Winslet said filming the scene took some adjustment.

"I just kept saying, ‘This is too … weird'," Winslet told Entertainment Weekly.

"And Leo was like, 'Oh get over it.' And I’m going, 'Yeah, a little reminder: You’re my best friend. He’s my husband. This is a bit weird," Winslet told the magazine.

For DiCaprio and Winslet, the sex scene was a reprise of sorts, because they had some steamy on screen lovemaking together in the 1997 blockbuster hit Titanic.

Actress Rachel McAdams, 31, the Canadian-born star of The Notebook and Mean Girls, took a similar position on love scenes in an interview with New York Times publication T Magazine.

"A kiss with anyone, on or off camera, can be intimidating," McAdams said in the interview, which was featured on the magazine’s website.

"I’ve been kissing for nearly two decades now and I’m always convinced I’m not doing it right. Chemistry is so important in a great kiss.

"You can act your way through anything, but it’s hard with a kiss."

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