Sissification (or Feminization} is the practice, of switching the gender role of a male submissive to female.
It is usually achieved through cross-dressing, where the male submissive is dressed in female attire. There are many degrees of feminization; some include wearing female undergarments to being fully dressed in effeminate attire and make-up, intentionally playing to many classic female stereotypes.
Some submissive males often take on tasks, overtly feminine behaviors and roles (such as being a sissy maid or talking with a lisp), and adopt female mannerisms and postures in such activities as sitting, walking and acting in a feminine manner.
The costume is sometimes very domestic, suggestive of servitude and often out-dated, distancing the submissive male from acceptable feminine clothing and even farther from contemporary conventional male attire. This may also be an opportunity for ageplay, further diminishing the submissive male's status.
Alternatively, the costume may sometimes be very suggestive (e.g. mini-skirts), linked to other male fetishes regarding female clothing (e.g. PVC or latex attire), and exaggerating female characteristics (e.g. high heels and corsets).
Naming may also be employed. A submissive male may be given a female name, designated as "a good girl", or given a name which is an explicit insult applicable to females, such as "whore" or "bitch' or even "slut" which while it may not be an insult in all cases, implies out-of-control female lust, a reinforcement of the feminization.
Greater levels of feminization may also mean the male being the recipient of anal sex using a strap-on dildo or a male accomplice.
While many may find sissification to be a form of humiliation, many participants view the activity as a positive reinforcement of role.
Using sissification as a punishment is often called pinaforing or petticoating and is considered a form of negative reinforcement.
See also CD/TV.