Ah,why do we like cartoon/animated charactors and what makes us so attractive to them.
My answer is, boobies are boobies, plain and simple.
And since guys are creatures who are attractive to things by sight, seeing a female animated charactor with perfect physic and features are more than likely going to get our attention. Along with that if thier personality is something a person would find attractive as in "Man, she has a smoking hot bod, the face like a godess and an attiude to back it up, shes my type of woman", then boom, you have a crush.
But its a good thing to find a person wiether there animated or not to be attractive to not only thier outer apperance, but who they are on the inside too. But in all do respect, please find a real girl that you can like, even find one that to you is like your favorite animated crush, just for pete's sake let them be real...