I think you're confusing biological sex and sexual orientation. The poster above stated that sexual orientation is based off your DNA. There is no gene that determines whether you heterosexual or gay.

It has nothing to do with gender. You're just trying to proliferate your opinion that gender = biological sex. Anyone that is transgender would disagree with your opinion.

Sooooo your source is gamergate/redpill bullshit propaganda. Okay. Have fun with that.