Personally, I would talk to my doctor before (intentionally) having sex with someone who is poz, just because I am that cautious. For example, kissing is safe; however, what if you have gum problems? What if the person isn't exact with their meds? Online info is great, but it can't answer questions. And, a doctor will give you the straight up answer.
I appreciate that you are respectful of him while being cautious for yourself. Poz men face much rejection, I'm sure, when it is not a reflection on their sexiness or their quality as human beings. And, it is a testament to your escort's character that he was upfront with you about it.
Please let us know how it went, @youngboldone .