I would agree that in general, American culture does not portray Asian men as very sexy or manly.
That doesn't mean that they aren't sexy or manly in reality, however. Personally, like RowanThorn I do find often find Asian guys attractive. There's an Asian-American dude I worked with not too long ago ... I bumped into him once at a fast-casual restaurant, ended up having lunch and great conversation together, and walked away thinking, "Damn, that could have been a pretty decent first date." Or better yet, just the beginning of one. The other man in my "Lewd Beach" story is based on him.