The bourgeois ideology has a strong demand that adolescents, having reached sexual maturity, be repressed in sexual abstinence. To justify this sad privation, which is the basis of their unhappiness, all sorts of unscientific and ridiculous justifications have been made up. This doesn't happen, anthropological cross-cultural studies have shown, in many contemporary societies which don't have a marked patriarchal ideology (an ideology pushed by the bias of technologies like intensive agriculture and mechanization, and which are therefore controversially termed "primitive" by westerns). Anthropologists who have studied such people include Bronisław Malinowski, with his 1929 work "The Sexual Life of Savages in North-Western Melanesia", Ploss-Bartels, Havelock Ellis, Hans Meyer on the Wahehe and Wossangu.