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>>7878
I've seen lots of places where the line is drawn.
There's the feminist view: all men are rapists, so it's okay as long as there are no (human) males in there. I suspect this claim is actually created by straight men who only want to see women getting banged by dogs and horses because they're into humiliation.
There's the "passive only" stance. Basically, as long as the human is always the one getting penetrated or using their mouth/hand, it's okay. It boils down to: no men penetrating female or male animals (or, in theory, women using strap-ons or dildos, though I've never seen that). The reasoning behind this is that it's possible to hold down a dog and forcibly penetrate them, but it's not really possible to force a dog to mount you — he'll just jump off if he's not interested. However, this runs into trouble with "dildogging", which many claim is a form of abuse as it probably hurts the dog.
Ideally the best is disallowing anything where the animal is clearly in pain or struggling to escape, but that's not possible unless the moderator(s) personally check every video. The rule could be something like no non-sexual abuse: so no beating, forcing, whipping, snuff, that sort of deal. It would still rely on people to flag suspect videos for the moderators to check, and that still relies on people being civil and not being hypocritical fucktards about other people's fetishes.
You might be able to do something where animal/woman and animal/man is separated. In my experience, it's usually the people who like the former and don't like the latter who start shit. Considering the oversaturation with animal/woman in the genre to the exclusion of most everything else, you might be able to get away with making a couple stickies that the "gay" stuff has to stay in. Then the whiny straight men can just hide that thread and go about their business.
(Oh, and thanks for bringing back /sm, by the way. Forgive me for not trusting the word of politicians at face-value. You've gained my respect, for what it's worth.)