The old chestnut about "My right to swing my fist stops at your nose" is an example of where our personal freedom must be limited.
Children or minors should be spared the assaults of child porn. I see no need to regulate any kind of porn if it reaches only the sad and sick adults who trade such visions for their own titillation.
Bestiality? I can think of few reasons to regulate this and they have to do with disease. Of course, an argument could be made on the basis of animal rights.
I, too, think that legalizing and regulating prostitution makes sense, but few pols in state governments would risk their seats to push laws that many find difficult even to talk about.
Along the legislate-and-regulate line of thought, I have always believed that it made sense to allow illegal aliens to have driver's licenses. They will drive anyway and, as it is, they can vanish in the night after causing death or injury on the road if they cannot be traced through a license. Aliens who can drive legally know that they are on a database, which encourages them to act with at least some degree of civic responsibility even if such actions are only fear-based. (I hesitate to say the above, knowing it will open up the immigration debate, and I myself have trouble deciding where I come down on the ten million Mexican and South American illegals in this country and how to handle the issues there. I live in a state with an enormous illegal population. Surely, DTOM has his own passionate views on this as do most Californians.)