Kinsey himself avoided and disapproved of using terms like homosexual or heterosexual to describe individuals, asserting that sexuality is prone to change over time, and that sexual behavior can be understood both as physical contact as well as purely psychological phenomena (desire, sexual attraction, fantasy).[citation needed] Instead of three categories (heterosexual, bisexual and homosexual), a seven-category Kinsey Scale system was used (an 8th category for asexuals was added by Kinsey's associates).
Wikipedia, Kinsey Reports
No. It is literally Impossible. If you are gay then you were gay from the start and it might have just kicked in late. If you are gay you cannot become straight. If you are straight you cannot become gay. You can do gay acts but you wont literally be gay.