One of the earliest sexual orientation classification schemes was proposed in the 1860s by Karl Heinrich Ulrichs in a series of pamphlets he published privately. The classification scheme, which was meant only to describe males, separated them into three basic categories: dionings, urnings and uranodionings. An urning can be further categorized by degree of effeminacy. These categories directly correspond with the categories of sexual orientation used today: heterosexual, homosexual, and bisexual. In the series of pamphlets, Ulrichs outlined a set of questions to determine if a man was an urning. The definitions of each category of Ulrichs' classification scheme are as follows:
One of the earliest sexual orientation classification schemes was proposed in the 1860s by Karl Heinrich Ulrichs in a series of pamphlets he published privately . The classification scheme , which was meant only to describe males , separated them into three basic categories : dionings , urnings and uranodionings . An urning can be further categorized by degree of effeminacy . These categories directly correspond with the categories of sexual orientation used today : heterosexual , homosexual , and bisexual . In the series of pamphlets , Ulrichs outlined a set of questions to determine if a man was an urning . The definitions of each category of Ulrichs ' classification scheme are as follows :
Was his classification scheme meant for males or females?
Was his classification scheme meant for males or females ?
meant only to describe males
meant only to describe males