Prostate gland stimulation

I love a man that wants to please me and I have one but I also get very turned on when I’m able to pleasure him also. I like to try new things and I hinted around the idea of stimulating his prostate gland while I was going down on him a few times and he was totally freaked out by the idea. I told him that it was normal and that he would like it if he would let me try. Eventually he did and enjoyed it very much. This is not something we do all of the time but he is worried that is strange to like something like that. Please back me up on this one.