General: breasts

Soft round growths that serve as a secondary sexual characteristic for female or intersex characters. Breasts are often tipped with a nipple, or covered by a nipple_tuft.

If breasts are present in a scene, they should be tagged no matter if the character is clothed, or nude.

Some cultures consider bare breasts to be explicit, but this varies a lot by region. Since e621 is a global site, bare breasts should be rated Questionable.


There's a variety of nicknames for breasts. Breasts, boobs, tits, titties, hooters, knockers, jugs, ta-tas, melons, mammaries, etc.


The full range of breast sizes can be approximated using the following tiered system. There will always be a few cases that are difficult to place in one category or the other; just do your best to fit them into one or the other.

▼ Breast sizes


flat chested

A character with no breasts.

  • Do not use this tag for male, maleherm, cuntboy or other manly body types.
  • Do not confuse with cuntboy.
  • Most cub characters are generally flat-chested, but most loli will have either a flat chest or small breasts.


small breasts

Not flat chested, but can be from below average size to just developing.

  • Most cub characters are generally flat-chested, but most loli will have either a flat chest or small breasts.


big breasts

Pretty big, but still smaller than the bearer's head.


huge breasts

Still physically plausible to somewhat unlikely. Equal or exceeds the bearer's head in size.


hyper breasts

From too large to physically carry and beyond.



Breast-Related Fetishes

  • breast_expansion: Breasts being artificially made to grow (or that have been made to grow) beyond what is biologically possible.
  • breast_pillow: When a character rests their head on another character's breasts, commonly large breasts, like it were a pillow.
  • breast_pump: A milking machine used to suck milk from the breasts.
  • busty_feral: A feral character with breasts. Not to be confused with huge_teats.
  • mouth_nipples: Breasts with mouths where the nipples should be.
  • teats: Breasts that are located on the stomach, towards the pelvis; usually referencing animals whose real world biology features several pairs of nipples.
  • multi_breast: A character with more than two breasts.
  • multi_nipple: A character whose breasts have more than one nipple each.
  • natural_breasts: Breasts that sag and droop in reaction to gravity, under the curious theory that perky breasts must mean either that the character has silicone implants or that the artist isn't talented enough to draw "natural" breasts.
  • non-mammal_breasts: Used when characters who aren't mammals have mammalian breasts.
  • udders: A character who either has a bovine udder growing out of their lower torso in addition to breasts, or has udders on their chest where human breasts would be.


  • between_breasts: When an object, character's head, arm, penis, or whole body between excessively large breasts.
  • breast_squeeze: Squeezing the breasts.
  • breast_suck: When a character's breasts are being sucked on.
  • breast_milking: Milking the breasts, whether by hand or with the use of a milking machine.
  • grope: Touching or fondling the breasts with their hands.
  • breast_fondling: Fondling the breasts.
  • breast_squish: When a character's breasts are pressed against something or someone.
  • breast_rest: When a character's breasts are resting on something, usually flattening out.
  • breast_smother: The act of pressing one's breasts against another character's face.
  • cum_on_breasts: When a character has cum on their breasts.
  • cum_between_breasts: When a character cums between a character's breasts during a titfuck.
  • nipple_suck: When a character's nipples are being sucked on.
  • self_suckle: The act of sucking on one's own nipple.
  • bouncing_breasts: When a character's breasts are bouncing up and down.
  • titfuck: When a character rubs their erect penis between another character's breasts.
  • nipple_penetration: Penetration of the nipples (often with a penis).
  • nipple_in_pussy: When a character's nipple is penetrating another character's pussy.

See also:

forum #187716 - Mammary tags discussion:[..] (Mar. 2016)
forum #20968 - Tagging of Breast Sizes - a new Forum (Jul. 2011)
forum #17012 - Huge_breasts > Hyper_breasts (or vice versa) (Jun. 2011)

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