My mom won't let me have glamour magazine? Please help?

I'm 17 (close to 18) and I have been reading glamour magazine @ Barnes & Noble for who knows how long. I decided I wanted to get a subscription so i can keep the magazines, but my mom thinks some of the content is bad. I've had the talk about some of the content in glamour in health last year and I think that she needs to get real with today's society and realize that I am not 12 anymore. How can I convince her without saying these things?

Thanks.