How does one guy look at another guy and think about having sex with them ????
It’s a revolting idea.
Not for a woman.
Therefore it is presumable that gays look at guys like women look at guys. And lesbians look at women the way you do. Its repulsive to you because you're not gay.
Well in some cultures it’s part of their culture as with many in the Muslim world such as Aphganistan......
So if a young child grows up with this being presented as normal, and often they’re enticed with monetary gifts etc.....well they’ll become immune to what otherwise would be repulsive to them.