Hello- Thank you for asking the question. I have over 30 years of experience working with individuals, couples and families & am happy to reply.
I am sorry that this is a problem for you. Obviously a neurotic conflict and one related to appropriate boundaries with your roommate or you would not be asking the question..
One one hand you wish to be a naturalist, the other you have conflict about not controlling this behavior in front of your roommate.
Well, it's a conflict Dr. because 'society' says it's taboo.
I actually encourage you to continue the behavior and although you recognize this as a societal tabboo- (which is a healthy boundary) in the privacy of your own home, be nude as much as you want and as long it is not detracting from the relationship with your roommate.....fine. IF it is causing a problem with your roommate either this has to be resolved or you have to make a choice of living alone.
That is my opinion and I wish you the very best.