We'll there are preventative measure that people can take. Think of it as a car. You wouldn't blame someone if they got hit in a car accident. You wouldn't say "if you didn't want to get in an accident you shouldn't have driven" They knew the risk when they drove but it still isn't their fault. Same can be said about sex. People know the risk and they take preventative measures, accidental births still happen. I wouldn't consider it dumb or a fault. It's apparent that you're a virgin because only a virgin would say something like that. Once you have sex u can guarantee that your opinion will change.