So, here's my family nudity strange situation from this year's Thanksgiving. Earlier today I was traveling between family locations when I arrived at my dad's house. He raised me alone, and he was pretty open about nudity. Once I was a bit older, I felt comfortable enough to say let him get something out of our one bathroom while in the shower or being ok walking around some naked. I got to his house today after being on the road. I wanted to take a shower, and he let me use his shower instead of having me drive home 30 minutes away. My stepmother wasn't there, so I just got naked as I always do at home. I mean, he is the one that taught and encouraged me to be ok with nudity, and he was the only one there. However, he seemed to be really bothered by this. He didn't say anything, but he insisted that the door be shut to the bathroom, etc. This is not his usualy behavior, but he was very sure to be private when he took a shower after me. Should I ask him about it? Do I need to apologize?