In criminal and civil law, assault is an attempt to initiate harmful or offensive contact with a person, or a threat to do so.
How is "assault" different from "battery"?
Traditionally, if the victim has been actually touched by the person committing the crime, then a battery has occurred. If the victim has not been touched, but only threatened, then the crime is assault. In many states, the distinction between assault and battery has been abolished and either type of action may be charged as an assault.
Does sexual assault usually involve a weapon?
The majority of sexual assaults are committed without the use of a weapon. Even fewer sexual assaults by an acquaintance, rather than a stranger, are committed with the use of a weapon.