Kinsey Scale

The Kinsey Scale was developed by Alfred Kinsey, as a way to measure one's sexual attraction. It has six rungs, from exclusively heterosexual to exclusively homosexual. It is a common way of measuring these things, however since it doesn't include identities on the asexual Spectrum or aromantic Spectrum, it has recently been overtaken by several other sources.

An example of use - one could be at a four on the kinsey scale, and therefore under the 'bisexual umbrella'. This includes sexualities such as bisexuality, omnisexuality, pansexuality and anthrosexuality, among many. Someone at a four or five would not identify with labels like heteroflexible, meaning mostly straight.