Bestiality

This character has sex with animals. Part-human, part-animal characters like Mikan or Tamamo don't count as "animals" for this trait. Neither do monsters and monster-like beings, in which case use Sex with Monsters instead.

Bestiality is the practice of sexual activity between humans and non-human animals (bestiality), or a preference for or fixation on such practice.

Apply this trait to the human participant. Don't apply it to the animal participant.