Honestly, I am suspicious of him. I think he may have started using numbing cream when he started doing American/International collabs.
I only say this because ,in his Japanese scenes, he was a lot more expressive and reacted to what was happening to him. In his American/International collabs, he has been collabing with men that have the BIGGEST tools lol something that would tear you apart! LOL and its like he is not even blinking an eye while he's getting plowed down xD
Just an observation and theory of mine of course