Rape
Rape is physically coerced penetrative sex, and according to victimologists, may include all forms of sexual contact between an adult and a (usually prepubescent) child.
Whilst as inherently damaging as any other form of highly intrusive physical assault, the psychological effects of rape often depend on taboo and post-traumatic intervention.
Law
Rape is generally described as a crime - generally more severe and taboo than other forms of assault. Some forms of rape are particularly hard to define - for example Child rape.