Iran pinglist?
"There is no nation which so readily adopts foreign customs as the Persians...As soon as they hear of any luxury, they instantly make it their own: and hence, among other novelties, they have learned pederasty from the Greeks." (1.135)
The Greek text reads paisi misgontai, literally "to have intercourse with boys" (or "children").
But Cyrus would have encountered Greeks only late in his life, after he conquered the Greek cities of Asia Minor, so the supposed introduction of this practice would probably be later.