The crime of rape or "first-degree sexual assault" in some states, generally refers to non-consensual sexual intercourse that is committed by physical force, threat of injury, or other duress. A lack of consent can include the victim's inability to say "no" to intercourse, due to the effects of drugs or alcohol. Rape can occur when the offender and victim have a pre-existing relationship, sometimes called "date rape" or even when the offender is the victim's spouse.
Under a variation known as "statutory rape," some states make it unlawful for an adult to engage in sexual intercourse with a person who has not reached the age of consent, usually 18 years of age.