London: Move over Viagra, potions and oils, sunbathing is more than enough to boost men''s sex drive, says a study.

Researchers at the Medical University of Graz in Austria found that levels of testosterone, the male sex hormone, in men's blood rise accordingly with doses of Vitamin D.

The vital nutrient is produced in the body after exposure to sunlight and is also contained in oily fish and meat.

A spokesman for the Sunlight Research Forum in Veldhoven, in the Netherlands, said: "Men who ensure their body is at least sufficiently supplied with Vitamin D are doing good for their testosterone levels and their libido among other things."

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