sexual abuse

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Criminal sexual activity, especially that involving a victim below the age of sexual consent or incapable of sexual consent.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any sexual activity that is undesired by one participant but forced by another participant nonetheless.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a statutory offense that provides that it is a crime to knowingly cause another person to engage in an unwanted sexual act by force or threat