The Kinsey scale, also called the Heterosexual–Homosexual Rating Scale, is used in research to describe a person's sexual orientation based on one's experience or response at a given time. Wikipedia

Social distribution of sexual orientation Wikidata

A scale devised by Alfred Kinsey, used to measure a person's sexuality, ranging from 0 (exclusively heterosexual) to 6 (exclusively homosexual), passing through different stages of bisexuality, including the 3 in the middle (bisexual, attracted to men and women equally). There is also an X option, for those exhibiting no sexual attraction (asexual). Wiktionary