Apophallation

Apophallation is a technique used by some slugs following intercourse.

The slugs (which are hermaphroditic) have relatively very large penises which wrap around each other in a tight spiral. They can have difficulty separating afterwards. Should that be the case, the solution is for the slug to gnaw off either its own, or its partner's penis - making separation possible. No replacement penis grows. The apophallated slug adopts a purely female function.