It wouldn't be useful in a case like that. However, if heads answer yes, tails answer truthfully "Have you ever raped a woman"? You get 52% saying yes, you ca

It wouldn't be useful in a case like that. However, if heads answer yes, tails answer truthfully "Have you ever raped a woman"? You get 52% saying yes, you can conclude that 2% actually did so. You need a considerably larger sample size for the same accuracy of data, though.