IT’S long been thought that beauty is in the eye of the beholder but scientists reckon there are six physical features that explain why a man might check out a woman.

Apparently men are biologically hardwired to prefer specific traits that are associated with good health and fertility.

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While women look out for physical strength - an indication of  man's ability to provide and protect them.

According to Dr Midge Wilson at DePaul University, in Chicago, Illinois, guys do a "reproductive fitness assessment" in their mind to see if you're the perfect match for them.

Here are the six things they're looking at:

1. High-pitched voice

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Researchers at the University College London say that having a higher-pitched voice represent youth and a smaller, feminine body.

2. Your smile

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Researchers at the University of British Colombia that "the whiter the teeth, the better".

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3. Wearing less makeup

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Bangor University in Wales say blokes , with 40 percent fewer cosmetics.

4. Big hips

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Studies show that men are more attracted to women child-bearing hips.

To be precise a waist-to-hip ratio of 7:10 - in other words, an hourglass figure, a small waist, big bum and wide hips.

5. Healthy hair

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Long, lush locks are a turn on for men because it's a one of those things that is linked to good health and fertility.

6. Wearing red

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The colour red has always been associated with sex appeal so put on that scarlet dress and knock him off his feet.