Guy (or girl) who is sexually curious, not necessarily due to sexual preference, but rather due to environment, peer pressure, predominance of alternate lifestyles in immediate surroundings. (From the adage "Monkey see, monkey do.")

Marginalized Orientations, Gender identities, And Intersex. it’s meant to be an all inclusive umbrella term for asexuals, homosexuals, multisexuals, trans people, and intersex people. Alternative to LGBTQIAP+
Alternative to MOGII, easier to pronounce.

Bi-curious george is

someone who doesnt quite know if they are gay or straight and they're willing to try something new... secretely.