Women who meet the requirement of "being as fierce as wolves and tigers", the simplest way for men to improve their ability. Sunbathing can increase men's libido.
A new study in Austria showed that sunbathing could enhance men's libido. The testosterone level in men's blood would rise with the increasing intake of vitamin D. This essential nutrient can be produced within the human body when exposed to sunlight, and also can be obtained by eating oily fish and other meat products.