Cognitive and cultural embeddedness: combining institutional economics and economic sociology
According to this, pederasty is sexual relations between two males, especially when one of them is a minor. Other definitions, like the one that JSBangs found, differ slightly. But otherwise, I think you answered the question yourself: pedophile refers to the attraction, while pederasty refers to the act itself.
ped-. or paed-. var. of pedo- before a vowel: pedagogue. -ped. a combining form with the meaning âhaving a footâ of the kind specified by the initial element: pinniped. Compare -pod. [< Latin -ped-, s. of -pÄs -footed, adj. derivative of pÄs foot] ped. 1. pedal.