For me it tends to boil down to a few things, the main one being authentic lust. Sound is also pretty important to me, mute videos are just not as good. You tend to find these things largely in home-made videos.
In no particular order:
- Women who film themselves (bonus for webcams or first-timers)
- Women who talk dirty/are vocal (Cupcake tends to be good at this)
- Women who are 'forced' in bondage or D/s scenarios
- Women who are unrestrained in their lust (frantic sucking/riding)
- Animals have to be properly into it, I don't care much for (commercial) stallion/woman or dildogging, it tends to be too.. neutered, almost. Doesn't help that a lot of the stallion/woman content looks like it is/was shot with geldlings, considering how passive they are.
- Animals have to be (mostly) clean, I have absolutely no interest in scat or watersports. Some squirting tends to be unavoidable for mares though, but that's okay.
- Mares and bitches who cum whilst being fucked (bonus for sloppy wet sounds)
- Bitches being fucked by dicks big enough that you see their pussy being 'dragged' in and out
- Men who creampie animals
- Men who have a threesome with a woman and female animal, swapping between or being sucked/licked simultaneously
Conceptually hot, but haven't ever found videos (so by all means, if you have any, please share):
- Men who have a woman help/prepare them/their female animal partner with oral
- Men who are encouraged with dirty talk, or indeed even 'forced' to fuck a female animal by a woman.
- Women eating out a female animals (human) creampie
There's also something special about women who are objectively gorgeous according to western beauty standards being fucked hard by animals, preferably dogs. The knowledge that they could likely have their pick of human partners, but they choose to fuck a dog instead.
Female dogs dominating human males.
Like my past mate gripped my trachea area with her teeth then thrusted into me while licking my ears/face.
It's always the guy on top or doing the penetration instead of the female the one being the leader of it.
I'll be honest: never really thought of this before, but it sounds pretty hot. If you've got any videos, could you send me a link or two?