No, not at all.
You should not touch a girl's bra without her knowledge and permission. If you are not close enough to a girl to ask her how to touch her bra, then you don't need to worry about it.
Getting breast cancer has nothing to with wearing a bra.
You don't.
Go into another room and remove it there. That way, she'll never know you were wearing it in the first place. If you mean remove from girl that is sleeping, you don't !
wear a padded bra
10
Your only option is to guess the girl's bra size. If you are not buying her a bra, you don't need to know her bra size. Try to find out something that's important to her instead.
No it does not. It's not good for them to sleep with a bra on though.
You call a girl with no bra on by her name. She is no different than a girl with a bra on, she is a person who made her own clothing choices.
No.
There is no "normal" bra size. It varies from girl to girl.