Theodoor Hendrik van de Velde
Encyclopedia
Theodoor Hendrik van de Velde (February 12, 1873, Leeuwarden – April 27, 1937 near Locarno
Locarno
Locarno is the capital of the Locarno district, located on the northern tip of Lake Maggiore in the Swiss canton of Ticino, close to Ascona at the foot of the Alps. It has a population of about 15,000...

 in a plane crash) was a Dutch
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 physician
Physician
A physician is a health care provider who practices the profession of medicine, which is concerned with promoting, maintaining or restoring human health through the study, diagnosis, and treatment of disease, injury and other physical and mental impairments...

 and gynæcologist who served as Director at the Gynæcological Institute in Haarlem
Haarlem
Haarlem is a municipality and a city in the Netherlands. It is the capital of the province of North Holland, the northern half of Holland, which at one time was the most powerful of the seven provinces of the Dutch Republic...

. His 1926 book Het volkomen huwelijk (The Perfect Marriage) made him an instant international celebrity. The book advocated knowledge and sensuality in erotic life. In Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 Die vollkommene Ehe reached its 42nd printing in 1932 in spite of the fact that it was placed on the list of forbidden books, Index Librorum Prohibitorum
Index Librorum Prohibitorum
The Index Librorum Prohibitorum was a list of publications prohibited by the Catholic Church. A first version was promulgated by Pope Paul IV in 1559, and a revised and somewhat relaxed form was authorized at the Council of Trent...

 by the Roman Catholic Church
Roman Catholic Church
The Catholic Church, also known as the Roman Catholic Church, is the world's largest Christian church, with over a billion members. Led by the Pope, it defines its mission as spreading the gospel of Jesus Christ, administering the sacraments and exercising charity...

. In Protestant and social democratic Sweden
Sweden
Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

, Det fulländade äktenskapet was widely known although regarded as pornographic and unsuitable for young readers long into the 1960s.

The English translation, Ideal Marriage: Its Physiology and Technique
Ideal Marriage: Its Physiology and Technique
Ideal Marriage: Its Physiology and Technique is a famous popular scientific treatise and self-help book published in London in 1926 by Dutch gynecologist Theodoor Hendrik van de Velde, retired director of the Gynecological Clinic in Haarlem, and "one of the major writers on human sexuality during...

was the best-known work on its subject for several decades, and was reprinted 46 times in the original edition, selling well over a half-million copies.

He is credited with showing in 1905 that women only ovulate once per menstrual cycle. This contributed to the improvement of calendar-based methods of birth control, and later to the creation of other fertility awareness
Fertility awareness
Fertility awareness refers to a set of practices used to determine the fertile and infertile phases of a woman's menstrual cycle. Fertility awareness methods may be used to avoid pregnancy, to achieve pregnancy, or as a way to monitor gynecological health....

systems.
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