date rape

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

• noun Rape committed by a person who has been socializing or on a date with the victim.

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

• noun non-consensual sexual activity between a victim and perpetrator that know one another.

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

• noun rape in which the rapist is known to the victim (as when they are on a date together)