To a straight man, perhaps the men in League aren't sexualized. I am a gay male, and I find the men pretty sexy usually. I do understand the reasoning for some of the sexy outfits on the women though that I see people complain about quite a bit.
I see complaints about Janna quite a lot, why is she so scantily clad? She doesn't have to look like a slut, etc. Here are my reasons for Janna being dressed the way she does. Example A) In my mind, she is kind of slutty, for example, her quote about for only so much money a minute blah blah blah. Not to mention, she is a wind mage to all extents and purposes. She shouldn't be wearing a ton of clothes, the clothes she wears are minimal, it's not going to keep her down when she is throwing wind in your face.
Zyra is another champ I see get criticized from time to time for being sexy. My response is that she was a plant her whole life, she doesn't understand the concept of clothes, why would a plant need clothes?
Now let's go to a male champion that is has been sexualized.
Graves for instance, older man, completely clothed, I know people are into older men, personally myself I am not. Now take his Pool Party skin. Damn he is hot. There was no reason to make him so buff and muscular, he fires guns, he doesn't punch and wrestle, why does he need to be so muscular? Not to mention a broad, hairy chest. Sexualized male champion. Not a kind of sort of sexualized, it's sexualized. I get that if you are a straight male, you won't view it as sexualized, for women and gay men though, yes, it's very sexy.
People have to realize, you have to take the good with the bad. Some girls are sexy, some don't feel the need to be sexy all the time. For example.
she is completely covered, she looks like she is ready to battle, she really doesn't look sexy at all. But now take her Frostblade skin, obviously Frostbutt Irelia is sexy.
Think of it this way, sometimes you get up in real life and put on sweatpants and a baggy hoodie. Sometimes you get up and spend forever making yourself look as sexy as possible. You have to take the good with the bad, as I said, there are other things to nit pick about rather then boob armor. Ahri's new splash art was reverted back to her old one because it didn't capture her character as well as the old splash art did.
Kayle's new splash art still looks powerful and strong, just like her old one. It's not like adding two bumps to her chest armor is changing that. She isn't going to be running around the fields of justice blushing and batting her eyelashes at the enemies, she is still going to punch them into the ground because she is powerful and strong. Just now it is more obvious she is a woman.
Edit: Not to mention, no one is going to want to run around on the fields of justice as a freaking nun, covered in clothes from head to toe. You don't play League of Legends because you want social justice and want the women you are running around as to be ugly. You play a champion because you like how they look and what they do.