US site: Aggravated sexual assault is a felony sexual offense governed by state laws, which vary by state. It is typically defined as a sexual assault that maims, wounds, or disfigures the victim, or involves a victim who is physically or mentally incapacitated. It may also be defined to include a sexual assault that is aided or abetted by another person, occurs during commission of another crime, or involves use of a deadly weapon. Local laws should be consulted for specific requirements and applicable penalties.
http://definitions.uslegal.com/a/aggravated-sexual-assault/