We can see a buttock in the first episode and again in season 3.

Sex is implied between a man and woman. They're shown waking up together, covered up.

A man discovers sexual messages between his girlfriend and another man. She's shown to have sent him photos of herself in her underwear.

A woman hands her teenage daughter a box of condoms.

A woman discovers she's pregnant and seeks out abortion pills. However, she decides to keep the baby.

Characters are killed in gruesome ways by other characters or the aliens, e.g. shot and stabbed.

The robots kill people on sight, including children.

A teenage boy locks a man out of a room to be killed by robot aliens.

A man is beaten up by a younger man in prison. His bruises are shown later in the hospital wing.

A man is shown strangling another man to death.

Gunfights and chases are shown frequently between humans and aliens.

A pile of bodies/skeletal remains are shown being lit on fire.

A man is shown to have committed suicide by cutting his wrists. The act isn't shown but the bloody rags wrapped around his arms are clear evidence.

A robot alien shoots through a woman's palm.

A soldier is shot through the neck. He's shown struggling to breath and gurgling blood before dying.

An older man sacrifices himself to save his group of friends by blowing himself and a gang of robot aliens up with a grenade.

A woman is shown to be contemplating suicide when her two children are killed. She discusses this with two people before deciding to proceed. She shoots herself in the head off screen but the shot is heard. A bloody bedsheet is shown where her body is covered.

1 use of the F-word

Multiple characters shown smoking.

The initial invasion is quite scary as people don't know how to escape or survive. Billions of people are shown dead from the alien technology and continue to lie in the streets throughout the show.

A woman is shown fitting.

The entire show has a very bleak tone with violence and an unrelenting sense of dread.