Английский словарь американских идиом - facts of life

{n. phr.} 1. The truth which we should know about sex, marriage, and births. * /His father told him the facts of life when he was old enough./ 2. The truths one learns about people and their good and bad habits of life, work or play. * /As a cub reporter he would learn the facts of life in the newspaper world./