fact of life

noun

any aspect of human existence that must be acknowledged or regarded as unalterable:

Old age is a fact of life.

Idioms

facts of life, the facts concerning sex, reproduction, and birth:

to teach children the facts of life.

Origin

1850-55

British Dictionary definitions for facts of life

facts of life

plural noun

the facts of life, the details of sexual behaviour and reproduction, esp as told to children

facts of life in Medicine

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

Slang definitions & phrases for facts of life

noun

An explanation of human reproduction, esp for a child: facts of life explained in a sixth-grade film

Idioms and Phrases with 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 ]