[Urbane Guerrilla]

Man on child, however defined, doesn't seem to appear as a "definition of marriage," which is how I read Santorum's remark. Heterosexual unions with a wide age difference strike me differently from Classical Greek paederasty -- which was itself notable for being a minority practice only, and not apparently widespread enough to occupy even the entire bisexual population of ancient Greece.

I'll read the "Man on dog," and while we're at it, cf. the Arab historian's account of a Viking funerary ritual featuring "man on mare." Yep, it was a different way to mount a horse.

Now the way I read the Wiki entry on "dog" is that the whole business is much more a ritual, often performed for luck, than ever thought of as a way to make a family. It looks like no one anywhere tries to make that leap.