<human>: As a little background I was raised conservatively and in general am not comfortable around random people's private parts. 

I've spent the night at my boyfriend's place about once or twice a week (it was talked about with roomie before they moved in together) and the last three or four times when my bf and I have been in the living/kitchen area his roomie will walk around shirtless. I understand that it is her place too and she should be comfortable there so I haven't said anything about it and avert my eyes. Last time she was walking around topless in the kitchen she made a comment after about five minutes saying she just realized she didn't have a shirt on.

Is it within my place to say anything about it to bf or roomie? I'm kinda uncomfortable about this stuff so how would I even phrase that?

Summarize the given text in a few sentences.
<bot>: I'm not very comfortable around nudity but my BF's roommate has walked around topless every time the last 3-4 times I've stayed over. Can I bring this up or should I deal with it?