Consider it kind of like birth control pills – if taken perfectly, they’re 99.9% (or whatever percent) effective at preventing pregnancy. However, that’s if you take the pill every day, at the same time every day, with no missed doses, or any other factors that may decrease the pill’s effectiveness (ex: antibiotics often reduce the pill’s effectiveness, and most pill manufacturers recommend you use a back up menthol of birth control while taking antibiotics.) how many people do you know who remember to take a pill every single day at the same time without fail, never missing a dose?
Same concept with condoms, used correctly yeah they’re effective. But a condom can be faulty, have a hole, be expired, it could break. Or the person using it could put it on incorrectly (inside out) all of which reduce effectiveness.
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