A latest study has found that sunbathing boosts sperm quality in men. They become better at swimming towards the egg, have greater speed and are more penetrative.
Researchers at the University of Copenhagen tested the quality of sperm from 340 men and found that almost half had an insufficient amount - linked to lack of exposure to natural sunlight or time in a solarium.
"Vitamin D levels were positively associated with sperm motility, suggesting a role for vitamin D in human sperm function," the Daily Mail quoted Dr Martin Blomberg Jensen as saying.
The study has been published in the journal Human Reproduction.