Maybe it’s late and I’m missing something, but I don’t see what’s so wrong or upsetting about being asked if you want a happy ending, especially from a masseur that clearly marks his RentMasseur ad as offering all of Therapeutic, Sensual and Erotic sessions. As long as he didn’t force himself on you in any way, you say no, and be done with it. Some guys are too shy to say they want an HE upfront. To me, it seems like a courteous gesture.
I’m also not getting why being Christian and straight has any relevance to his profession as a masseur. I see a str8 masseur regularly and I always get an HE. I appreciate his being open minded and comfortable with himself.