Colleen and Danny start kissing (a silhouette of the two is shown from an area of the dojo further away from the room they're in). colleen proceeds to take her clothes off (nothing is shown as her silhouette shows her with her bra and from a distance) and we see them having sex close-up (some cleavage is shown but is very minor and no real nudity is shown). The scene then cuts to the next morning where Danny is looking out the window - no nudity - and colleen wakes up and walks towards him wrapped in a blanket. No nudity.

there isn't really any nudity and sex is only brief

There is some sex with no visible nudity

The series contains several scenes of fighting and violence. Many of these are bloody and gory.

There is a scene where a man violently smashes the heads of two dead bodies with a hammer. We see their heads getting deformed and blood spraying out. We see him knocking out their teeth and the hammer covered in blood. A lot of blood leaks onto the ground. Extremely gory.

A man is impaled on a pole, and as he pulls himself off of it, a large amount of blood is gushing out of him.

A person is found dead, presumably from a drug overdose

A person is stabbed through the neck and out of their mouth with a sword. A lot of blood pours out of their mouth.

A person is repeatedly hit in the head with a spoon until they die.

A person does karaoke in a room full of a dozen people he killed, then he proceeds to strangle someone with a mic cord, and yank a sword out of a corpse.

A person is shot in the head causing blood splatter

Numerous stabbings and shootings that usually have bloody results.

One fight scene that supposedly lasts about 6 hours (we only see a few minutes) has the 2 characters become so bloody and disfigured that they're barely recognisable by the end.

A large chunk of skin is cut out of a corpse

A man is beaten into unconsciousness, then sliced in the abdomen causing heavy blood loss and near death.

A guy is shot in the neck and blood squirts out and is then shot 2 more times to cause death.

Someone falls and hits their head and fall unconscious and blood pools out and they wake up later and their face and hair is caked in dried blood.

Someone gets their head squished and it explodes off screen with extremely graphic sound effects and we see splattering all over a wall

the series dosent get really violent until episode 4.

"asshole", "damn", "shit", "bullshit", and "effed up" are used.

The illegal smuggling of heroine is a main theme.