Cannibalism

Cannibalism is the practice of eating human flesh, mentioned throughout the Fallout series.

Fallout and Fallout 2
Cannibalism is considered a social taboo throughout the wastelands, resulting in calls for the "extermination or reform" of anyone who engages in the practice. Josh Laurence comments to the Chosen One that he heard tribals eat their own dead, stating that "cannibals is cannibals in my book." Mason of the Salvatores in New Reno tells the Chosen One to "run back to yer tribe and cook up one of yer people for dinner." The Chosen One can sometimes encounter cannibals when moving around the northwestern parts of the map, near Arroyo. They appear in groups of three to six, armed with knives, spears, or nothing, and are hostile. Doc Morbid and Gretch ship human body parts to Iguana Bob for the production of "iguana bits" which is then sold to unsuspecting customers.

Fallout 3
In the Capital Wasteland, the entire community of Andale engage in cannibalism by luring visitors and killing them, preparing their bodies for consumption in a garden shed. The town was founded by families who survived the war, resorting to cannibalism when their shelters ran out of food. Jack Smith comments that lived in the town for generations.

Herbert Dashwood describes Harmon Jurley as the "psychotic cannibal" leader of Paradise Falls, that was "rumored to eat the slaves he couldn't sell." Hunters can be found randomly in the Capital Wasteland, selling strange meat. One of the hunters may state that they wanted to eat the Lone Wanderer from the beginning, but "but Jim said noooo."

Vance, the leader of the Family, explains that cannibals, or those who eat human flesh, are labeled as "monsters, demons and the unclean" by society. He describes his goal of assisting his group in transcending their cannibalistic nature by teaching them to only drink the blood of their prey as an alternative. If the Lone Wanderer still accuses Vance of being a cannibal, he insists that drinking blood is vampirism, not cannibalism.

Fallout: New Vegas
In the Mojave Wasteland, when the White Glove Society joined the Three Families, they signed a contract with Mr. House which strictly forbade engaging in cannibalism. If the faction violates this agreement, Mr. House states, "Is it really so hard not to engage in cannibalism?" Caesar describes rumors of a cannibal tribe that lived near Vegas in an underground cavern, commenting that this may have been the original members of the White Glove Society. When the Courier suggests the Boomers get their protein from cannibalizing others, Pete corrects them, stating "we're not savages."

The former Vault 22 Dwellers killed and ate the Spanish speaking residents of Zion Canyon, causing Randall Clark to attack and kill them until they were driven away from the area. Cannibal Johnson has a nickname given to him by some raiders he managed to scare away by biting off a bit of a raider's heart he cut out. Old Ben mentions a butcher shop that sold strange meat that gave people shakes, a symptom of eating human flesh.

Fallout 76
In Appalachia, a group of cannibals ambush guests that rent rooms at Mountainside Bed & Breakfast. A cannibalistic raiders group known as the Gourmands operates in the area as well, led by Morris and Edie Stevens until their exile for eating one of their own.

Scott Conroy and a park ranger named Kevin both fell into the sinkhole, surviving at first on moss and bugs. Micky, another member of the Gourmands fell in afterward, choking Kevin to death and convincing Scott to eat the remains to survive. Scott then proceeded to eat Micky. After being trapped in Monongah Mine, Earle Williams described his struggle with the idea of eating another human being, eventually losing control of himself, stating that "people ain't dying fast enough to satisfy my hunger."

Groups

 * Andale
 * Gourmands
 * Vault 22 Dwellers
 * White Glove Society

Fallout 3

 * With the perk in Fallout 3, new dialogue options are available with Robert and Vance during the Blood Ties quest.
 * It also impacts speaking with Jack Smith in Andale.

Fallout: New Vegas

 * The perk in Fallout: New Vegas opens new dialogue options, including when speaking with Marjorie during Beyond the Beef, the Courier can choose to tell her that they eat people too, which normally would be a  prompt.
 * In the same quest, when talking with Mortimer about the society's cannibalism, the Courier can convince him that they will help him, which otherwise would be another  prompt and require a Speech check.
 * Jas Wilkins asks the Courier about the tastiest thing they have ever eaten, to which they can reply in a unique way.

Fallout 4

 * The perk in Fallout 4 grants access to additional dialogue in the Fallout 4 add-on Far Harbor. Malcolm gives an alternate response upon being asked if he is a cannibal.
 * During The Arrival, instead of asking the Trapper Boss if they eat people, the Sole Survivor can ask them to help a fellow cannibal.

Appearances
Cannibalism is mentioned in Fallout 2, Fallout 3, Fallout: New Vegas, Fallout 4, and Fallout 76.