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Although the definition of rape varies across jurisdictions, it can generally be defined as a specific type of sexual assault that involves penetration, force or threat of force, and lack of consent. A related term is sexual assault, which involves unwanted sexual contact that does not necessarily involve penetration. Although sexual assault is a broader term than rape, the two terms are often used interchangeably in research. Another related term is sexual abuse, which is a term often used to refer to unwanted sexual contact with a minor. This entry focuses on adult rape and sexual assault. It includes information on the prevalence of rape, factors associated with increased risk of rape, the effects of rape and treatments for rape trauma, characteristics of perpetrators, and rape prevention and avoidance. The entry also includes a section on acquaintance rape because most victims are raped by someone they know, often someone with whom they have a relationship.

Rape Prevalence

It is difficult to estimate the prevalence of rape because most rapes are not reported to the police. Therefore, relying on official statistics greatly underestimates rape prevalence. Studies that ask individuals if they have been raped also underestimate rape prevalence because many people who have experienced an event that meets the legal best evidence regarding the prevalence of rape comes from large-scale survey studies in which participants are asked behaviorally specific questions, such as “Have you ever had intercourse when you didn't want to because someone threatened to use physical force if you didn't cooperate?” Studies that use behaviorally specific questions indicate that 15 to 20 percent of women and approximately 2 percent of men in the United States will be raped in their lifetime. Not surprisingly, then, women fear rape much more than men do, and this fear significantly restricts women's activities outside of the home. Despite the prevalence of rape, women underestimate their own risk and see themselves as at much less risk than other women.

Although much research on sexual assault has been conducted in the United States, violence against women, including rape, is a global problem. However, it is difficult to get accurate rape prevalence rates across cultures due to differences in research methods, definitions of violence, sampling techniques, and cultural differences that may affect respondents' willingness to disclose such experiences.

Rape Risk

Several demographic factors are associated with greater risk of being raped. First, as mentioned, women are much more likely to be raped than are men. Age is a second risk factor: Most rapes occur prior to age 25. For example, in one large study, of the women who reported being raped at some time in their lives, 54 percent were 17 years old or younger when they were first raped. A third demographic factor associated with rape risk is race. In a large national study in the United States, rape was most prevalent among American Indian/Alaska Native women and was least prevalent among Asian/Pacific Islander women.

Alcohol use also is a risk factor. Most rapes on college campuses involve alcohol use by the victim, the perpetrator, or both. In one large-scale study, women at most risk were those who frequently drink to get drunk. Studies of community samples of victims, especially those who seek help at an emergency department after the assault, also indicate that alcohol use is common among victims. Several factors contribute to this finding. For example, sexually aggressive men tend to target women who are drinking or intoxicated and also intentionally use alcohol (and occasionally other drugs) to impair a woman's ability to resist. In an effort to diminish their responsibility, perpetrators may also attribute their own behavior to the fact that they were drinking. Finally, alcohol use by men may make them more likely to misinterpret a woman's behavior as indicating sexual interest. In fact, some studies show a greater role for offender than victim drinking in sexual assaults.

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