You sound really worried about other people’s sexual orientation. You must be having doubts of your own.
The term "orientation" is literally a facing to the east, or the Orient. The term "sexual orientation" implies an Asian nightclub with a dating scene often symbolized by the Chinese Yin-Yang ☯.
Any connection between "homosexuality" and the peculiar terminology of "sexual orientation" would probably have originated in Chinatown, San Francisco.
"Like dude, there's purty gurls at the club, why don't you come along with us, unless you're like totally gay?"
In other words, people are full of everlasting bullshit.