Marital Happiness: A New Contribution to the Solution of Sex Problems is a famous book by Maria Carmichael Stopes, published in 1918. The author carefully examines the topic of intimate relationships in marriage, offering new approaches and solutions to overcome various sexual problems and misunderstandings. The book went through many editions, thanks to its openness in communicating about intimate issues and helping to strengthen relationships between partners. "Marriage happiness" is considered a classic in the field of psychology of family relations and relations between a man and a woman.