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a good manga style illustration can I would say give the same feeling as listening to a good musical work for the first time, or, if you are capable to feel it, see a cute or attractive real girl. we call it in this context “moe”. sexual arousal can be mixed in with that, but it usually does not have to. Even for the pics that have a sexual element to them, it is usually on the level of pin-up models where people don't actively goon to the pictures but just like for the boost in mood they give. As for the downloading part, it is like downloading music you like, or just looking at it online, depends on the person. And then there are just reaction pics of series people like, which is a topic I won't touch on in this post.