People feel threatened by fictional characters that have been sexualized with great effort. They feel inadequate when they see the opposite sex lose their minds and drool over a film celebrity or an anatomically impossible cartoon character. Your average Joe/Jane can never live up to the appeal of some actor who gets paid to spend 6 hours a day in the gym, has personal trainers for fitness, nutrition and whatnot, and sits in the make-up room for two hours before they put them in front of a camera, under flattering lighting conditions. Then they CGI and color grade the hell out of the footage and real people kind of look rather unassuming compared to this artistic figure.