In season 1&2 there are multiple scenes in which a werewolf is shown to be or spoken of as being mentally ill. This always includes uncontrollable violence.
In season 3, Olivia gets sick and it's affecting her brain, inducing visions and making her lose self-control.
A girl consents in the beginning, but becomes uncomfortable and says she wants to stop. Guy proceeds anyway and then uses his mesmorisation abilities to make her forget it happened.
i guess ?? a few characters are vampires, including one of the main characters. also in an episode a werewolf transforms and eats the remains of his skin.
edit: OH and a character eats placenta(? as part of a ritual
Roman drinks blood several times throughout the show and usually becomes very ill because of it. It definitely happens in S1E5 and S3E1, but I am sure it also happens several times in season two but I am unsure when.