ROLE-PLAYING: WHAT IS BDSM

BDSM is a term which describes a number of related patterns of human sexual behaviour. The major subgroupings are described in the abbreviation "BDSM" itself:
Bondage (BD)
Bondage & Discipline (B&D)
Domination & Submission (D&S, DS, D/S)
Sadism & Masochism (or Sadomasochism) (S&M, SM)

Many of the specific practices in BDSM are those which, if performed in neutral or nonsexual contexts, are widely considered unpleasant, undesirable, or disadvantageous. For example, pain, physical restraint and sevitude are traditionally inflicted on persons against their will and to their detriment. In BDSM, however, these activities are engaged in with the mutual consent of the participants, and typically for mutual enjoyment.
This emphasis oninformed consent and safety is also known as SSC (Safe Sane and Consensual), though others prefer RACK (Risk Aware Consensual Kink)), which places the emphasis more on informed consent, and acknowledges the fact that all activities are potentially risky.

Note that confusion can occur in translations between English and French, where the name "jeux de rôle" is applied both to game and psychodrama.

Sexual roleplaying is the sexual behaviour of playing some kind of character during a sexual encounter, in order to evoke a sexual fantasy in oneself and/or one's partner.
Sexual roles can be very general designations of power position, sometimes abstracted to TOP and BOTTOM or very specific, detailed fantasies. Nearly any role could become the base material for an erotic experience, but certain scenarios are typical in pornography and probably in real life as well, though it is difficult to collect empirical data on such things.
Many of the most common sexual roleplays, such as Doctor/Nurse, Guard/Prisoner, etc, involve a power differential. These roleplays are often, but certainly not always, carried out in the context of a BDSM encounter. See power exchange for more on power relationships and sex.
Often, and especially in cybersex, sexual roleplaying is used to act out a sexual act that would otherwise be taboo or forbidden.

There is lots of characters couplings in sexual roleplaying, for me the interesting one are:
Oficcer/Soldier
Captain/First Mate
Farmer/Pig
Historical Couples
Jailer/Prisoner
Prisoner/Prisoner
Master/Slave
Police Officer/Civilian
Police Officer/Suspect
Sergeant/Ensign
Stranger/Stranger

Original still from TALKING ABOUT RUBBER BOOTS AND MACHINE GUNS and still from THE BUNKER (2001)