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Anal sex has been more accepted in modern times; it is often considered a natural, pleasurable form of sexual expression. If someone takes Truvada each day for a month and then stops, the anal sex protection yielded from the drug remaining in the body 24 hours, three, five and seven days later is an estimated 97 percent, 96 percent, 93 percent and 90 percent, respectively. The Journal of Urology. Eighty-two to 91 percent of participants had detectable tenofovir in their blood at the study visits they made every other month. Moreover, the volumetric information about individual materials within the sample was estimated.