I'm not trying to justify anything here, but unfortunately that's the way men are built. To objectify not just women, but also other men.
Who do you think buys bodybuilder magazines? It's men. When they make a movie and have the hero (or heroine) all dressed up with close fitting armour and visible muscles everywhere, who do you think that's for? That's right, it's for the guys watching the movie.
There are some women (and men) out there who have the bodies to be able to play on this, and while it's mildly offensive to me, it's probably not for the same reason as it is for you and other women.
I find it offensive because I prefer substance, over form, and if I'm honest probably a small extent because I like to think I'm above such superficialness. It's not because I don't find them attractive, or can't see why they would be attractive to other males. I see the gloss as an act of subterfuge, and I don't like being manipulated. I really don't like the fact that I can't help being manipulated, regardless of my awareness of it.
It's not going to make an ounce of difference however. Sexuality sells, and most guys don't care, just so long as they can see the outline of a boob and a good set of curves and imagine themselves with them, or triceps, biceps and good set of abs and imagine themselves having them.
At the end of the day you're fighting against the nature of males and while I and many others are doing our best to take a stand and stand up against it and other injustice. To teach our sons the wrongness of it, and teach our daughters to be aware and wary of it (and self-defence classes for when that doesn't work), there's the opposite proponent out there that are doing exactly the opposite, and while I like to think the world is becoming an incrementally better place for my daughter to grow up in, I'm afraid at times that I'm simply delusional.