Reply To: Advice on how to find man for my girlfriend

Studies done on heterosexual sero-discordant couples — where one partner is HIV-positive and the other HIV-negative — show that HIV was transmitted in zero to two percent of couples who correctly and consistently used male condoms for both vaginal and anal sex. With typical use, the HIV transmission rate increased to between 10 and 15 percent.

http://goaskalice.columbia.edu/answered-questions/explanation-condom-failure-rates

In other words, the failure rate for condoms is 2%. The failure rate for humans is much higher.