When I was an escort, i always asked if they had been tested and what the results were but I never asked to see a copy of the test. I did share mine often, and I had a few guys send me a screenshot of theirs, unprompted. As a client, no one has asked for a copy of mine, but it certainly wouldn’t offend me if he did. It suggests to me that he takes his health seriously. You can always block out your name and personal info on the test if keeping your identity private is a concern. I don’t see the harm.