The idea that gender identity and biological sex were two different entities came much later, by which time the archetype of the two gender identities were deeply ingrained into the minds of the people.
After some bitter experiences in the Gay world, I had decided to go with the Straight world, to gel in. But as it turns out, I don't feel like myself over there too.
There are degrees of bisexuality - we are not half-gay or half straight. Degrees can vary from lusting after the same-sex while being emotionally involved with the opposite sex or vice versa, to lusting and being emotionally involved after the same and the opposite sex