• Sexual orientation is often framed on a binary-gay OR straight; homosexual OR heterosexual. Why can sexual orientation be thought of as a continuum? Solution Sexual orientation is a psychological or physiological understanding of sexuality in humans.It is thought of as a continuum as it undergoes a gradual transition from heterosexuality to homosexuality.There could exist sexual attraction towards opposite sex (heterosexual) exclusively at one end or attraction towards same sex (homosexual) exclusively at the other end..