Daughter see daddy naked?

I'm dating my boyfriend for 9
​Months he has a 9 year old daughter the other day I came from work he was taking a shower with the door open Hes cellphone ring hes daugther was in my room and she went to The living to answer the phone and ran to te bathroom and gave the phone to her father but her dad was totally naked he was still in the shower is this normal? I ask him why he let his daughter see him naked and he told me thats a way to teach hes daugther not to be shy but I don't get it I'm totally confused now