Sticking my nose in where it may not be welcome (I am after all, a guy), I would submit that magazines such as Cosmo, Glamour, Redbook et al fall under the category of “near occasions of sin”, for both men and women. Men, in that the covers are titillating, resulting in the near occasion of the sin of lust.
For women, the influence is a bit more insidious. They encourage an entirely materialistic lifestyle; “How to look sexier/thrill your husband with sex better” and so on.
Sex is a good thing, but it is not the only thing. These magazines reduce sex to the Pleasure Principle, which is insufficient by itself. Like advertising a car only based on its stereo system. Sounds good, but does it GO anywhere?
Also, in teaching young women in high school, they are quick to note the example these magazines teach in terms of looks; physical (and often nearly unattainable) perfection is the goal. Makes it dangerous in that it encourages its readers to focus on how they LOOK, rather than how they live in Christ.
Did that make sense?