Question: Alfred Charles Kinsey, was an American biologist, professor of entomology and zoology, and sexologist who in 1947 founded the Institute for Sex Research at Indiana University, now known as the Kinsey Institute for Research in Sex, Gender, and Reproduction, he is well known for which scale, that is used in research to describe a person's sexual orientation based on their experience or response at a given time? 
Sentence (from "Scales of sexual orientation"): Those difficulties motivate researchers to define scales to measure and describe sexual orientation.
Relevant evidence: No