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- Someone who fall as a two, three, or four on the Kinsey scale may identify as bisexual, polysexual, omnisexual, pansexual or another multisexual label. Someone who falls at a one or five may identify as heteroflexible or homoflexible respectively, though they may also identify as a multisexual term.