Sexual orientation to persons of the opposite sex.(noun)
Sexual activity with another of the opposite sex.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "heterosexuality" in a sentence
"Are you saying that heterosexuality is a choice or that acting on it is a choice?"
"Because heterosexuality is (equally?) certainly apt to produce “powerful friendships” or “passionate love” in subjects — and even a “great idea” or two now and then ..."
"Rob Berra: they are mainly psychs of any or no religion who say RESEARCH shows gays can find satisfaction in heterosexuality, in effect, becoming straight."