Rape is a type of sexual assault usually involving sexual intercourse, which is initiated by one or more persons against another person without that person’s consent. The act maybe carried out by force, under threat, or with a person who is incapable with valid consent. The definition of rape varies both in different parts of the world and at different times in history. According to the American Medical Association, sexual violence, and rape in particular, is considered the most under-reported violent crime. When part of a widespread and systematic practice, rape and sexual slavery are recognized as crimes against humanity and war crimes.
The rate of reporting, prosecution and convictions for rape varies considerably in different jurisdictions. The U.S. Bureau of Justice Statistics estimated that 91% of U.S. rape victims are female and 9% are male, with 99% of the offenders being male. In one survey of women, only two percent of respondents who stated they were sexually assaulted said that the assault was perpetrated by a stranger. Several studies argue that male-male and female-female prison rape are quite common and may be the least reported forms of rape. Rape is also recognized as an element of the crime of genocide when committed with the intent to destroy, in whole or in part, a targeted ethnic group.
Rape is defined in many jurisdictions as sexual intercourse, or other forms of sexual penetration, of one person by another person without the consent of the victim. The World Health Organization defined rape in 2002 as "physically forced or otherwise coerced penetration even if slight of the vulva or anus, using a penis, other body parts or an object. Some countries such as Germany are now, however, using more inclusive definitions which do not require penetration in the 1998 International Criminal Tribunal for Rwanda defines it as "a physical invasion of a sexual nature committed on a person under circumstances which are coercive.