Below is a list of diseases found with extraordinary frequency among male homosexual practitioners as a result of anal intercourse. Sexual transmission of some of these diseases is so rare in the exclusively heterosexual population as to be virtually unknown. Lesbians are also at higher risk for these STDs:
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Anal cancer
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Chlamydia trachomatis
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Cryptosporidium
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Giardia lamblia
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Herpes simplex virus
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Human immunodeficiency virus
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Human papilloma virus
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Isospora belli
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Microsporidia
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Gonorrhea
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Viral hepatitis types B & C
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Syphilis: gay men contracted syphilis at 3 to 4 times the rate of heterosexuals.
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HIV/AIDS: A study based upon statistics from 1986 through 1990 estimated that 20-year-old gay men had a 50% chance of becoming HIV positive by age 55. As of June 2001, nearly 64% of men with AIDS were men who have had sex with men.
