Aaaaand... That makes it appropriate how?
Is it because some people have a magic ability to give dictums to what other people can and can not enjoy?
Or because the naked human form should never be considered pleasant to look at, and hang at walls, as wallpaper, etc?
That's marketing thinking though, not a real moral objection.
>Imagine if you wanted to go into a field such as nursing and all of the men in the text books were oiled up shirtless muscular dudes.
This is not text books though. It's a student page. If another student, a woman, has pictures of shirtless ripped-abs male actors in her page, I wouldn't bat an eye.