Task: Question Answering
Input (English): Passage: Some research suggests that "[f]or some [people] the focus of sexual interest will shift at various points through the life span..." "There... [was, as of 1995,] essentially no research on the longitudinal stability of sexual orientation over the adult life span... It [was]... still an unanswered question whether... [the] measure [of 'the complex components of sexual orientation as differentiated from other aspects of sexual identity at one point in time'] will predict future behavior or orientation. Certainly, it is... not a good predictor of past behavior and self-identity, given the developmental process common to most gay men and lesbians (i.e., denial of homosexual interests and heterosexual experimentation prior to the coming-out process)." Some studies report that "[a number of] lesbian women, and some heterosexual women as well, perceive choice as an important element in their sexual orientations." Question: Until 1995 what had no studies done concerning sexual orientation?
Output (English): longitudinal stability of sexual orientation over the adult life span.