Condoms prevent pregnancy only 86-98% of the time when they are used correctly. And that is with the knowledge that most women only ovulate once per month with only a few days window in which they can get pregnant.
With STD's, you can contract it every single time you have sex. If the failure rate for pregnancy prevention is 86-98%, I wonder what the true failure rate for "safe" sex" is?
What is a condom failure? Is that just when the thing breaks into shreads?
The Aids virus is much smaller than the natural pores in a condom....no use at all in prevention, claims to the contrary notwithstanding.