“…Right after HIV discovery, condom effectiveness in reducing the HIV risk was evaluated (Conant, Hardy, Sernatinger, Spicer, & Levy, 1986;Davis & Weller, 1999;Judson, Ehret, Bodin, Levin, & Rietmeijer,1989;Pinkerton & Abramson, 1997;Rietmeijer, Krebs, Feorino, & Judson,1988;Van de Perre, Jacobs, & Sprecher-Goldberger, 1987). Regarding heterosexual transmission, a 60%-96% relative risk reduction has been estimated (Giannou et al, 2015;Lassi, Imam, Dean, & Bhutta, 2014;Liu et al, 2014;UNAIDS, 2004;Weller & Davis, 2002). A meta-analysis carried out by Giannou et al, 2015 evaluated HIV infection RRs after comparing "always" versus "never", and "always" versus "not always" use and estimated that, consistent use provide an approximately 70% relative reduction in HIV risk.…”