Sharon Osbourne thinks of the Queen whilst having sex with Ozzy.

The 59-year-old matriarch admits that after almost 30 years of marriage, she and her Black Sabbath rocker husband have their love-making routine down to a carefully-honed art.

She told The Sun newspaper: ''We have sex at a particular time.

''Ozzy loves David Letterman. We lie in bed and watch it and he says, 'Oh, we've just got time before Letterman's monologue'.

''I lie back and think of the Queen.''

Despite having spent three decades together, the host of US chat show 'The Talk' insists their love-life is very much alive and kicking.

She told the Daily Star newspaper: ''We make love all the time.

''We used to do it five times a week. I take breaks from my chat show to have sex.''

Talking about some of their raunchiest times, the matriarch revealed: ''I don't think it was that crazy, but I had, well, unusual sex at a rock concert in the audience and I was sat on my husband's lap. I had a long dress and I sat on my husband and we were rocking to the music.''