A person who, unlike Bisexual, can only have sexual relations with one sex, but can love either sex. Short for "flexible" or "flexamourous".
Guy 1: Hey, did you hear about Daniel and Samantha getting together?
Guy 2: No way! But I thought Daniel was gay?
Guy 3: He's a gay flex, not gay.
Guy 2: No way! But I thought Daniel was gay?
Guy 3: He's a gay flex, not gay.
by Person12743 September 6, 2016

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