It's a risk. But the same could be said for condoms in nightclubs.
Generally, the best public safety campaigns work are "defense in depth". You discourage sex in general, discourage unsafe sex, discourage casual sex, discourage polygamy, provide condoms, and encourage tests. It all generally works, as long as you don't treat any of it as a magic bullet.
It's the extremists who either think a) abstinence is the only protection; or b) causal sex is fine as long as you take precautions; who cause problems, as they tend to discourage defense in depth.
So ideally, they would have an ambiguously enthusiastic "Over 90% accurate!" blurb, and be packaged with a condom or two.
Generally, the best public safety campaigns work are "defense in depth". You discourage sex in general, discourage unsafe sex, discourage casual sex, discourage polygamy, provide condoms, and encourage tests. It all generally works, as long as you don't treat any of it as a magic bullet.
It's the extremists who either think a) abstinence is the only protection; or b) causal sex is fine as long as you take precautions; who cause problems, as they tend to discourage defense in depth.
So ideally, they would have an ambiguously enthusiastic "Over 90% accurate!" blurb, and be packaged with a condom or two.