Oddly, being an Asian myself, I'm not too keen on the skinny or super slim ones. But at the same time, I dislike those who look overly muscular (like pro-bodybuilder type) as well, because IMO muscle looks much better in Western people.
I like semi-muscular ones. You know, the one with a bit of bulk to it, but not too much. Like having some actual meat instead of just bones you can firmly grab. Someone like Daigo, perhaps?
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Then again, I do have to dig the face first, then the body comes next. Because if the face is not my type, he's instantly a turn off. In fact, I've favored some guys who are a little chub or not athletically inclined, just because their charming face was a redeeming quality.