Here are some thoughts based on my rich history of hookups and various fwbs/fbs.
Sometimes sex with Asian guys goes as usual. They usually bottom.
I had several encounters with Asian guys that were somewhat odd. It sometimes starts in foreplay, and sometime it starts when I start fucking. The oddness is in a way they touch me. It's a combination of pinching, grabbing, and tweaking various parts of my body, including earlobes. While it was not a complete turn-off, it's not the experience I dream about every night.
I had no so great experiences with non-Asian guys, but mainly due to a lack of interaction in foreplay.
I did not mean to generalize these findings, so you interpret that as you wish.