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.
In nature you're supposed to, being able to is related to health problems.
But yeah, I will raise my son/daughter in heterosexuality, if he/she wants to be gay/bi/etc that's fine. But I don't expect little boys to like other boys for example
Look at Disney