There are some things Sacha Cohen's fiancee just isn't willing to compromise for, so it's either choose the girl or an empty bed to sleep on.

Sacha Baron Cohen's fiancee Isla Fisher will go to bed with Borat, but refuses to sleep with gay Austrian fashion reporter Bruno.

The "Wedding Crashers" actress was prepared to put up with Cohen staying in character as the controversial Kazakhstani TV reporter while he shot his hit film, "Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan."

However, she is not prepared to afford him the same luxury when he starts work on his Bruno movie.

A source told the National Enquirer magazine, "Isla grudgingly endured months of living, and sleeping, with Borat when Sacha was making the movie as he had to stay in character while he was filming. But now he plans to make a Bruno movie she says she absolutely won't let him stay in character 24 hours a day."

The source added, "She has issued him with an ultimatum no Bruno in the bedroom or no sex until the film is finished."

After winning his Best Actor prize at the recent Golden Globe Awards, Cohen dedicated his triumph to Fisher because "she agreed to sleep with Borat for ten months."

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