True, that's a good point. But I think it also helps that in manga, if ass shots really, really bother you, there are quite a number of reading alternatives even in the same genre. Well, I don't know about "fanservicey romantic shonen manga," but say, if the fanservice in one shonen manga bothers you, there's lots of non-fanservice ones. That's ... much less true of American comics, and even some creators have spoken of how hard they have to work to get editorial and artists not to stick fanservice in everywhere when that's explicitly not what they want.