Body count
A study of older adults found that those who had had more sexual partners were more likely to have developed cancer, but that does not mean there is a causal connection, and there are many ways tha...
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Compared with women who reported 0-1 sexual partners, those who said they had had 10 or more, were 91% more likely to have been diagnosed with cancer. Among the men, those who reported 2-4 lifetime sexual partners were 57% more likely to have been diagnosed with cancer than were those who reported 0-1.
we already know of ways that sexual behavior can indirectly affect cancer risk without actually causing cancer, especially through sexually transmitted infections. Some of the strongest connections are for:
human papilloma virus (HPV), which increases the risk of cancers of the cervix, mouth, penis, and anus
human immunodeficiency virus (HIV) infection, which increases the risk of cancers such as Kaposi’s sarcoma and lymphoma
hepatitis B and hepatitis C infection, which have been linked to liver cancer
gonorrhea, which increases the risk of prostate cancer (particularly among African American men).