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One of the most common sexual fantasies is thinking about someone else while making love to your partner.

It is a well-established opinion that in couples this happens because of the sexual routine.

More than half of men and women fantasize about having sex with someone else when they are actually having sex with their partner, researchers have found.

As many as 62% of women and 56% of men share that they imagine they are in bed with someone else, the Sun reports.

Top 10 kinkiest sexual fantasies

Dating site saucydates.com asked 8,371 members what they really think about when they have sex.

So women admit to fantasizing about movie stars like Daniel Craig, Brad Pitt and Bradley Cooper.

Men also list actresses in their fantasies - from Rihanna and Katy Perry to Lady Gaga, Rita Ora, Jennifer Aniston.

Both men and women admit that they can't rule out imagining themselves doing it with their best friends, co-workers, porn stars, their friends' partners, ex-partners, or someone they've had a one-night stand with .

Women's fantasies are more erotic, with 50 percent of respondents saying they fantasize about being on the beach or in a hotel room with someone else while having sex with their partner.

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Only 35 percent of men say the same.

"It's all pretty normal actually, but let's hope no one says the name of the famous person they're imagining, because that could be a bit awkward," joked study author David Manns.