There are very interesting psychological ideas for that. Just the other day I was reading something about an android of sorts who is pretty much human, just that she was able to do pretty much everything she'd want to do. Pretty fast as well. So seeing a human struggle while being unable to do what they want was something she was interested in. At first as a simple subject to observe. Something fascinating that's the very opposite of herself. And with time, that changes. After all she was still having all the emotions humans have, even though she wasn't one... technically. (i.e. doesn't grow older, can turn things like menstruation on or off... well not she herself but her maker, super resistant against normal illnesses, doesn't really "learn" but rather saves information and so on... though she can get a virus in a different way I guess.)
While this wasn't yuri related (at least... not much), there is obviously no issue to make it work with yuri. The difference can attract, is pretty much the message here. Just like a human may look at an android like that and get charmed by how able she may be to everything, the other way around is quite possible as well.