Siansonea II wrote...
I agree that asari would view human females as the most similar to themselves in appearance, but I can't really say what affect that would have. If anything, the "pureblood" stigma might make them less attracted to human females, being as how they look the most asari-like of aliens. I would even venture to say that would apply to male humans as well, because to asari and other aliens, the "huge" differences we see in human genders might seem rather less pronounced. Asari might fixate on human hair, since it's the most obvious difference between the two species, and less on the fact that male humans tend to be somewhat larger and have undeveloped breasts. Asari might see male humans as resembling very young asari who haven't yet developed breasts, that would seem to be the closest visual reference for them, especially male humans who aren't physically imposing. For very bulky male humans like Jacob, an asari might think he looks like a cross between an asari and a turian or something, what with turians having such a massive shoulder region. In any case, I doubt that asari have the same exact feelings and perceptions that we humans have, and all sorts of things are possible regarding their thought processes in selecting mates. 
I think, regardless, there are 'plot holes' in the asari being attracted to those that don't look much like them. They did evolve for milenia just mating with other asari. Given that there does seem to be a physical component to mating as well as the mental magic it would make sense to me that their would be a physical component of attraction as well.
What concerns me is that these potential problems are hand-waved away as 'no biggie' as they benefit a hetero-sexual pairing, while anyone trying to support a claim that a human LI could be bisexual gets attacked pretty harshly by some around here, and this potential bisexual human must 'totally make sense as bi' or it's no good....it's all or nothing here.... It's heteronormativity at work, of course, but I don't particularly like it much.