Indeed! Even assuming I'm somewhat better than typical, condoms make me a bit nervous.
Considering that most people are sexually active for far more than one year, that 2% rate is completely meaningless.
(Frivolous nitpicking) Yeah, but I think it's probably one of the better units of measure they could have chosen. "Per intercourse event" would probably be so low that people wouldn't grok the fact that their overall chances were much worse. But any unit more than a year doesn't make much sense.
I think a decent measure would be P(getting pregnant|one intercourse with condom)/P(getting pregnant|one intercourse without condom).
P/S/A: There are single sentences which can create life-changing amounts of difference.