That’s according to researchers in Austria, who found that testosterone levels in men rise at the same rate as doses of vitamin D, reports Britain’s Daily Telegraph.

Scientists at the Medical University of Graz discovered that men with more vitamin D in their blood had more testosterone than men with less levels of the main male sexual hormone.

Stimulated by exposure to the sun, 90% of vitamin D in the body is produced by the skin. According to telegraph.co.uk, the new study confirms earlier research that just one hour of sunshine can pump up a man’s testosterone level by nearly 70%.

That doesn’t mean that men looking to lift their libidos should go light on the sunblock – you can also get a healthy dose of vitamin D by eating oily fish and meat.