Some characters are in a strip club in season 4

In season 7, there is a couple sexual references between Barry and Iris

Lots of tight leather outfits (male and female), cleavage, and immodesty throughout the entire series.

Story arc in season 1 in which the main character likes the daughter of the man who adopted him but she is dating a man who happens to be her father's work partner.

Throughout the series people have been shot or stabbed with small blood sprays.

A man's heart explodes after being stabbed by the Reverse-Flash. We see blood pooling from the wound.

In season 2 the flash is beaten until he bleeds and then has is back broken by an evil speedster

Barry is a forensics scientist for the Central City Police Department, so he works in CSI, and the crime scenes are mostly murders. However, the murders are usually committed by metahumans, so nothing gory is seen.

Season 6 is way darker than the previous seasons - Bloodwork creates a black zombie like army of people.

During the fight between Team Flash and Cicada, we see Nora getting hit by his dagger causing a brief and small blood spray. Her back is also broken

A man is killed with cards. Not bloody but disturbing

Flash first fight with Savitar is quite violent. It's not as violent as the first fight with Zoom though

"The Man In The Yellow Suit" is probably the most violent episode in the whole show. We see Harrison Wells getting violently beaten by Reverse-Flash. Some blood on his face

The episodes in prison in Season 4 are quite violent and leads to blood and gore

Season 1 has to be the most violent and bloody. There is way more bloody violence in this season than in the others

Season 3 is the darkest season but is not as violent as the first two. There is still brutal violence but most of it is bloodless

Season 4 is violent when it comes to the prison arc. Outside of that, it is the same level as season 3.

Season 5 is not that bloody but Cicada kills a lot of people in ways that could be considered gory. On the same level as Season 3 and 4 in terms of violence

Season 6 is darker on its first half. Bloodwork uses blood to create zombies. The second half is tame though

Season 7 is the tamest and barely contains violence. No blood at all.

A man who turned into a zombie explodes and a black liquid is seen instead of blood. Could be considered gory

In season 8, a woman has a stroke after facing an evil alien. She is seen with blood coming out her mouth. However, she is not dead

Several burned bodies are seen in season 8. Not too bad but it could be disturbing

Cicada and his niece have meta-human powers due to dark matter wounds on their chest and forehead, respectively.

Violence throughout is common, though not gory and actual blood is very rare. Some people are wounded (occasionally killed) due to powers of meta-humans. The Flash's first encounter with Zoom is violent, though most of the injuries inflicted are implied rather than seen. The only blood shown is on Barry's face.

This show has very mild language like:Damn, hell

Some uses of ass, bitch, damn, sloppy

The phrase "this house is bitchin'" is a recurring gag throughout season 4.

Worst language that is heard is the word "bitch" or "bitchen" however this is quite rare in the show. Words like "Damn, ass, and crap" are more common.

Early in season 4 to celebrate something Joe West hands out Cigars to Barry, Iris, and Catlin and the show promotes it and they start fooling around smoking.

Barry's powers give him enhanced metabolism meaning he can't get drunk on normal beverages.

Occasional drinking throughout.

A lot of scene's containing Zoom can be quite uptight and intense.

The last episodes of season 3 are very dark and depressing

Many scenes containing DeVoe switching bodies can be disturbing to watch.

In some episodes, the overall theme is very dark and can be quite emotional.

Season 6 has some dark episodes exploring the theme of death towards the start of the season. Can be unsettling for some.

There is lots of frightening and intense scenes

Seasons 2, 3, and the start of 6 are pretty dark and intense

The villains can be frightening for younger viewers.

The show overall is tame and most of the time not bloody. But the fights can be intense and quite brutal. However, some sequences are clearly CGI animated.

Season 2 is darker and more emotionally intense than season 1.

As a consequence of meta-human powers, Clifford Devoe is wheelchair-bound and sometimes has seizures.

The Deathstorm episodes in season 8 are extremely intense, scary, and violent.