A female naked life model decoy is seen, no nudity is shown

Cleavage is seen occasionally.

Some episodes contain male characters shirtless and sometimes only in their underwear.

Season 6: Chloe Bennett wears a costume that shows a lot more cleavage than usual. This is done to show another character's fantasies of her.

It is mentioned a few times that two agents have a sexual relationship, but nothing is ever actually shown onscreen.

In one episode two characters are shown making out in a bedroom while taking off each others clothes. The scene ends there, but later it is shown they are together in the same room in their underwear. It is implied they had sex, and directly state in a later episode.

There are brief comedic references, nothing over-the-top. The word penis has been said once. A female character mentions the attractiveness of a mans built arms. A character jokingly implies she would repay a man who saved her.

A man crushes another man's skull while he's screaming for help. We can see his face getting crushed.

Season 5 contains more graphic violence than the previous seasons. Includes throats sliced, blood splattering, severed limbs, characters crushed to death, etc. One character's heart is ripped out of his chest.

Violent content increases as the series progresses: first seasons contain intense sci-fi type action and some deaths. Later seasons have more strong violence and scenes of torture, plus blood and some gore present. S4 to S6 are the most violent from my perception. S7 contains an EP that shows a lot of gore but it's mostly exaggerated.

There is a lot of torture. Graphic torture and screaming

After season 3, violence gets pretty bloody and graphic.

In season 8, there is almost no blood or strong violence up to episode 6. In episode 7 it gets really strong, with people being drilled, sawed, and brutally mauled. This contains very high amounts of blood like what you'd find in an R-rated movie.

During an autopsy scene, a man has the top of his head cut, revealing the skull. The surgeon then picks into and removes it, showing the dead man's brain.

During season 4, there are hyper-realistic robots that look like humans that attack the agents. Due to this, there is intense action with breaking their heads, power-drilling into their eyes, and dismemberment. There is blood in the robots to add realism to them. This makes for more violent scenes.

There is frequent hand-to-hand combat in the series, as well as gunfights and brutal action violence. Injuries are usually bloody, and characters beaten or bruised, but although the action is intense at times the main characters are generally good guys who win in the end. However, villains often die as well as side characters.

We see a severed hand on the floor of a train. Slightly graphic.

A woman is burnt to a crisp by a man with pyrokinetic powers. We see her body turn completely to ash.

A man tears through another man's chest and pulls out a rib, which is seen clearly. Both the rib and his hand are bloody.

A young man freezes another man with his cryokinetic powers and his body breaks when it is pushed to the ground.

A woman electrocutes another woman's face with a wire.

A man with alien markings all over his body uses a knife to make some cuts on another man's body and he screams.

A woman is vivisected by a HYDRA leader to obtain her regeneration powers to make himself younger. We see a sequence of disturbing images of her skin being sliced open during the operation and also see her insides, with some organs being removed.

Many random henchmen characters are shot down throughout the series.

Very little language is present throughout the series.

Frequent use of very mild profanities such as "damn" and "hell", but some stronger words have been used occasionally such as "son of a bitch" or "bastard".

Occasionally drinking has been depicted.

Even after Coulson's revival arc, the series is still intense and violent.

There is some scary content, such as jump scares and paranormal content. This is very infrequent, though.