I had a somewhat funny experience in a well known north side shop the other week...
After the flip, options were discussed, and I went for BS. The ML stripped and then went to her handbag to retrieve something. When she got back to the massage table I realized that 'something' was a condom. Somewhat confused I asked her what she was actually planning to do, and she answered that she did BS with a condom....
Now for that to make at least some degree of sense, the BSing would need to include some close-to-penetration activities, but I didn't get to find out because when she saw the puzzled look on my face, she sort of backtracked and offered me a BBBJ instead, which I accepted and which ended - not accidentally - with CIM...
I am still struggling to see the logic in all that.