Why don't the Males have any Private Parts?
I mean have you seen Stewie or Peter Naked? Neither one has a Penis. They claim that they can take a piss but how can they when there's nothing there?
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You must not remember Stewie's dream at the start of He's Too Sexy For His Fat. Stewie's little bump, which is literally how they drew it, is clearly seen until he covers it in embarrassment.
You also must not have seen the DVD version of Family Goy, Peter tells the Kathy cutout "I'm out" & when he gets up from the table he clearly is out.
Realistically though, FOX censors would never allow phalluses, even animated, to be flopping around during prime time.