When ones penis accidentally slips out of the vagina and into the anus during rough or rigorous sex.

When the penis is intentionally inserted into the anus during regular intercourse without permission, and or solicitation.

Anatidaephobia is defined as a pervasive, irrational fear that one is being watched by a duck. The anatidaephobic individual fears that no matter where they are or what they are doing, a duck watches.

Anatidaephobia is derived from the Greek word "anatidae", meaning ducks, geese or swans and "phobos" meaning fear.