If you work in a sexual health clinic you can get a bit cynical about whether people are telling you the whole truth as well as thinking that you might as well tell people to be ultra cautious.
I was having a check up last month, and while they didn't bat an eyelid at some of it, I got lectured about having condomless sex with my primary partner plus someone else we both see. Given that those are the only two people I've ever done bareback with and I got past thirty before it happened, I felt it was a bit rich of them, even making allowances for the above.