106 Collis, Clark (August 2002). Archived from the original on Retrieved 3 December 2012. Sussex Directories/ Psychology Today. Sexuality Now: Embracing Diversity. Of youths who had identified only as bisexual at earlier assessments, 60 to 70 percent continued to thus identify, while approximately 30 to 40 percent assumed a gay/lesbian identity over time. In his view, this was true anatomically and therefore also psychologically, with sexual attraction to both sexes being an aspect of this psychological bisexuality. "The Relation Between Sex Drive and Sexual Attraction to Men and Women: A Cross-National Study of Heterosexual, Bisexual and Homosexual Men and Women".