Story Codes:

Alternate Universe:  Story takes place in an alternate reality where it has always been commonplace for the males to be the one to be pregnant.

Body Swap:  Stories in which two or more different characters within the same story change bodies with one another.

Breast Growth/Lactation:  Stories where the male develops breasts and/or lactates as a result of the pregnancy (only applicable where the character stays male.) 

Chemical:  A chemical either makes the man pregnant, or enables him to become pregnant.

Crossdressing:  The lead male character dresses as a woman.

Gay: Character(s) involved are gay.

Labor/Birth: Story contains scene in which the character goes into labor and gives birth.  

Magic: The character is transformed/made pregnant by the use of magic.   

Mind Control: Character is brainwashed to become pregnant, or believe he is pregnant.

Operation: Character undergoes surgery to become pregnant. 

Pictures:  Story has photos and/or artwork accompanying the story.

Romance:  Lead character is in love with another character.

SciFi:  Pregnancy/change results from aliens, futuristic technologies, or or takes place in the distant future.

Shemale:  Character(s) in the story are, or become, Shemales/hermaphrodites. (have both sex organs)  

Simulated:  Character does not become pregnant, but experiences a fake one.  

Transgendered:  The lead male character becomes a female (by means other than body swap)

Story Ratings:

G:  Totally harmless.  No sex, no bad words, no violence. 

PG:  Contains mild violence (i.e. pregnant against will), mentions adult situations. 

PG-13:  Same as PG, but to a little bit more.  Also can include light profanity. 

R:  May include sex scenes, graphic violence, and obscenities.

XXX:  Contains graphic sex scenes.