Look at Disney
You need it.
I don’t know if I’m gay or bi or anything, but I had a relationship once with another man, no sexual stuff just dating
Just by not doing anything actually, most boys will tell their parents that they fell in love with x girl and gave them flowers
It’s mostly territorial
No, but from birth it’s normal to be told that boys love girls and girls love boy, the child has all the time to realize later who he/she want to sleep with.