You're a weird twister, at the end you're the one with homoerotic fantasies
Maybe he does, but bodybuilding is a narcissistic endeavor. Maybe all bodybuilders aren't exhibitionists, but I would venture a guess that most are. One would have to be in order to get on a stage in front of thousands or maybe millions of people wearing close to nothing at all. Even if you only consider the live audience, it's still a lot of people to get nearly naked for.
Note: this is not a judgment or criticism in at all. From my perspective, societies' hang-ups when it comes to nudity is just plain stupid. Furthermore, wouldn't most people rather see someone who is fit and naked then someone who has let their body go? How many people really find those old nudist camp videos interesting in a sexual way?