facts of life

fact of life

noun
1.
any aspect of human existence that must be acknowledged or regarded as unalterable: Old age is a fact of life.
Idioms
2.
facts of life, the facts concerning sex, reproduction, and birth: to teach children the facts of life.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
facts of life
 
pl n
the facts of life the details of sexual behaviour and reproduction, esp as told to children

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

facts of life pl.n.
The basic physiological functions involved in sex and reproduction. Often used with the.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Idioms & Phrases

facts of life

Knowledge of sexual reproduction, as in Some people feel that the facts of life should not be taught in school. [Late 1800s] Also see birds and the bees.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Idioms & Phrases
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