If so, then why did they make the Erics look more sexy than childish?

Because all imagineers are pedophiles who think highly of their own looks?

Just a theory not a serious suggestion.

I didn't think Eric's was particularly sexy, but perhaps I need a second ride.

I think the sex appeal of the animated princelings has always been more geared to gay men than living women (though cartoon women seem to groove on them just fine).