In University, in London, I went to the communal kitchen in just a pair of shorts. When I entered a female Muslim floor-mate started screaming like crazy and ran out. I felt awful.
Until she came back a minute later with her headscarf and started profusely apologizing for not wearing it in the first place. I'm standing there mostly naked as she apologized for being rude for thinking she could just hop across the hall and make some food in a few minutes without her headscarf on, and how she should have known better.
Once, she let me in her room, just the two of us, though the door stayed open. We talked about our culture and the differences (we'd bonded a bit over the headscarf thing). That was super, super racy for her and I appreciated what it meant for her (very friendly, very open, very progressive).