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The real risk of oral sex causing HIV infection is difficult to study, as most oral sex often leads to penetrative intercourse.
The unruly Chinese tourists seen in viral videos are only a small portion of the country's 1.3 billion people.
The first day of December every year for the last three decades has been designated as World AIDS Day. Apart from raising awareness of the AIDS pandemic and mourning for those who died of the disease since 1988, World AIDS Day has also done a great deal in fundraising for research and reducing taboo in the subject of this sexually transmitted infection.