Female roommate walked in on me naked in the shower. Is this normal?

I (24m) live with two female roommates I moved in with them about a month ago. We get along really well and have know each other for around two years. We have one bathroom so it's tough getting ready for work in the morning sometimes since we all start work around the same time. I was in the shower one morning, it's a big shower with a clear glass door. My one roommate knocks on the door and said she was coming in to brush her teeth and do her makeup. She knew I was in the shower and just walks in. I try cover my penis with my one hand, she walks in like is no big deal that I'm naked and she said "you don't have to cover up, I don't care". So I take my hand off and was just standing there showering naked right in front of her. We talked for a bit, she can see my showering in the mirror and would even turn around and talk to me right in front of the shower. I got to admit I got turned on a little knowing she sees my whole naked body and got a little hard but at that point I didn't care. She finished getting ready and before she left she said "I'm surprised you don't have a girlfriend. You have a nice naked body."

Is this normal? Has anything like this happen to anyone?
Female roommate walked in on me naked in the shower. Is this normal?
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