Women may have an increased risk of catching a common sexually transmitted infection during the long sunny days of summer.
However, a new study presented at a meeting of the American Association for Cancer Research says it's not just because people have more sex when the weather is nice.
Researchers who analyzed data from Holland say detection of papilloma virus infection during routine cancer screening peaks during August. They found that the sunnier the year and the sunnier the month, the higher the rate of human papilloma virus.
That leads them to believe that sunlight suppresses women's immune system defenses.