All in all, I don't see anything really wrong with wanting to make yourself look better as long as it doesn't become unhealthy, no one says anything if you want to make yourself more intelligent. Presentation is important to virtually every person in the world, only a fool would say otherwise.
I'm not too concerned about these articles giving tips on how to make yourself sexier either. It's a circular effect, everyone wants to look (or behave) more appealing. That's been the case for thousands of years. These articles just provide the reader with "helpful" tips. So is it these magazines and cosmetic companies that are too blame for pressuring people to look good? I don't think so, they're just cashing in on a demand that's been bubbling around for probably all of human history.
Maybe for health reasons, slim is sexy is the most objectionable idea though.
I actually think women overall are the lucky ones as far as looks go though... I'll explain... We're all a little vein, men and women, and we all want to look good (most of us anyway).
You have a naturally attractive male and a naturally attractive female. Neither are going to have to make much of an effort to look great, so lucky them.
Then you have the average looking male and the average looking female. The average looking female can still make herself look stunning with the help of cosmetics, I'm not so sure if the average looking male can, he'll generally look weird or alternative if he goes for the makeup option, probably not sexy to most people.
Then you have an ugly male and an ugly female... The ugly male is screwed, his options on making himself look good are severely limited, the chances are he'll live his life with little or no attention from the opposite sex, fewer friends (unless he has an outstanding personality or money), he might get depressed, maybe even commit suicide. The ugly female on the other hand with the right makeup can still make herself look pretty presentable if she decides she wants to make the effort. She doesn't have to, but at least she has that option! The guy is mainly stuck with his ugliness!
Some will say that makeup doesn't actually make women look sexier, they might be right in some cases but I'm not quite buying that in general. Here are some celebrities without makeup, how many look better?
http://www.topsocialite.com/celebrities-without-makeup/
Bear in mind, this is only really facial looks I'm talking about. Facial looks are probably the first thing most people notice, so if you're trying to work out what is sexy, the face might be the place to start. There are lots of other kinds of sexy of course, sometimes it's just a person's mannerisms, or their accent, their body, personality, money to some, the list goes on...
If anyone disagrees with anything I've said, as you might, I'm all ears!