Someone who is so sexy, you forget about meaningful ways a human being can be. You attach to these people based off looks and (in some instances) character or presentation.

Usually, fallacy is a result regarding your judgement.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.