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For this reason, Smith said he'd like to see future research aimed at the link between number of sexual partners and specific cancers. A new study suggests that people who've had 10 or more sexual partners in their lifetimes have a heightened risk of developing cancer. Certain sexually transmitted diseases like HPV, if left untreated, can lead to cancer. Comparing your "number," that is the amount of people you've had sex with in your lifetime, is often hush-hush banter among friends, but a new study suggests that number could have an affect on a person's cancer risk. They also looked at the various chronic disease the men and women reported having, including all cancer, heart disease, and stroke. For that reason, a person may have HPV without knowing it and spread it to someone else, contributing to the statistic that 14 million new HPV infections happen annually in the United States , according to the American Sexual Health Association. First, they grouped the men and women into categories based on how many sexual partners they reported having in their lifetimes: up to one partner, one to four, five to nine, or 10 or more. World globe An icon of the world globe, indicating different international options. For the study, the researchers looked at existing data for 2, men and 3, women who were 50 or older, and all British, from to to

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