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Oral sex has near-zero HIV risk according to new San Francisco study

US study finds genital herpes near doubles risk of acquiring HIV in gay men

Cells in foreskin vulnerable to HIV infection

Recent infection with genital herpes increases chances of HIV seroconversion

Oral sex cannot be linked to new HIV infection in 10 year Spanish couples study

Viral load critical in heterosexual transmission

'Bareback' sex ten times more risky for passive partner of HIV+ man than active partner