I personally think that possession, militia, thief, witch, scheme, conspiriator, torturer, black market, goons, rabble, cutpurse, young witch, sea hag and smugglers are far more severe in a "family game" than harem is. Might be that Europe/America thing though. Several of these are forbidden things in nearly every country, whereas harems are perfectly legal in quite a lot of countries.
That does not mean that I care at all about the fact that any of these cards are in a Dominion, even if I were playing it with exceptionally young or exceptionally old people.