The one on the left is sexually exploitive and the one on the right isn't. Why? The one on the left shows the person in a position that show off her body in a forwarding way. She is also on a beach that is warm and invited and many times associated with pleasurable sex. Also her face is warm and inviting. The viewer gets the sense that she is here for her enjoyment. The man on the left isn't in a position that shows off his body in a forwarding way but rather is withdrawn. Also he is in a communal shower, that environment is neither warm or inviting. It is a negative space and is associated with male on male rape. His face shows no sign of amiable feelings and is with drawn. The guys in the back look at him with malice and disdain given an air of confrontation and also him power.
It takes more than a naked body to show sexual exploitative. In fact you can sexually exploit someone who is fully clothed and showing nothing. For that motivational poster to work, then a sexually exploitive picture of the man should have been used.
That is a completely biased argument. For one, there are several instances where a man has been portrayed on a beach in a warm and inviting nature with little to no clothing. Is that deemed sexist? No, because there is a completely sexist notion that women should be the more modest gender. Also, they are making the exact same face in those two pictures. So how is one giving off a sex vibe while the other isn't? Furthermore, a shower is a scene that is definitely associated with fetishizing of the subject to viewers of the opposite sex, even if it is a communal shower. Since when has it not been?
To say that there is a difference in those two images where one is being sexualized while the other isn't is just ridiculous and frankly a bit naive.
What's naïve is too claim that because the guy is showing his muscles, he's being sexualized. It takes more than showing skin to sexualized something. If you show me a picture of guy at the beach with an inviting face on, standing in a position that shows off key aspects of his body, a body that is sexually detailed to perfection then I will show you a picture of someone being sexualized.