The rapist may use some type of instrument or foreign object to penetrate his/her victim.
Sexual areas of the victim's body become a specific focus of injury or abuse.
In several areas in Papua New Guinea, women can be punished by public gang rape, often sanctioned by elders.
In 1994, Richard Felson coauthored the controversial book "Aggression and Coercive Actions: A Social-Interactionist Perspective" with James Tedeschi, a book which argues that sexual fulfillment is the motive of rapists, rather than the aggressive desire to dominate the victim.
Gang rape is often viewed by the men involved, and sometimes by others too, as legitimate, in that it is seen to discourage or punish perceived immoral behavior among women, such as wearing short skirts or frequenting bars.
For this reason, it may not be equated by the perpetrators with the idea of a crime.
In one study, male rapists evaluated with penile plethysmography demonstrated more arousal to forced sex and less discrimination between forced and consensual sex than non-rapist control subjects, though both groups responded more strongly to consensual sex scenarios.
Drug-facilitated sexual assault (DFSA), also known as predator rape, is a sexual assault carried out after the victim has become incapacitated due to having consumed alcoholic beverages or other drugs.
Hence, their offenses may become repetitive and compulsive.
Prostitutes or other people whom they perceive to be "promiscuous" are often the sadistic rapist's targets.
The victims of a sadistic rapist may not survive the attack.
Sadistic rape usually involves extensive, prolonged torture and restraint.
Sometimes it can take on ritualistic or other bizarre qualities.Causes of sexual violence are debated and explanations of the cause include military conquest, socioeconomics, anger, power, sadism, sexual pleasure, psychopathy, ethical standards, laws, attitudes toward the victims and evolutionary pressures.