Okay so, I personally hate having this conversation, but let's do it anyway.
The reason why homosexual is homo
sexual is because the word is older than the widespread understanding of the distinction between sex (biologicals) and gender (identification).
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So, the word homo
sexual referring to sex isn't because of any basis in science, but just because people didn't use the word gender back then the way we do now.
Let's go over the meaning of sex and gender.
"Sex" is biological sex. It's based on the reproductive functions and/or chromosomes.
"Gender" is a mix of identification and presentation.
Certain things are divided into categories of masculine and feminine. Masculine things are things we happen to associate with the male sex. Feminine things are things we associate with the female sex. Masculine and feminine things are things of
gender, they're related to presentation and not reproductive functions or chromosomes.
Now, when you're sexually attracted to some random person, you haven't looked into their pants, nor do you know their chromosomes. That's because we base our attraction on a part of gender: presentation. If someone convincingly
presents femininely, your brain associates a feminine presentation with the female sex. It's as if they
were a part of the female sex. You would be attracted to their presentation: i.e., their gender.