Agreed but who bought her the magazine? Where did she get hold of it?
AND
If you managed to intercept all such material coming into the house you will never be able to stop it coming into her life. How do you stop her reading someone else's copy on the school bus, in the lunch break, at her friends house during a sleep-over?
Answer: you can't ~ so best to talk it through.
Such material should not be published I agree but when you have schools, by goverment decree, showing 12 and 13 year olds how to fit a condom onto a banana and having teacher led class discussions about oral and anal sex just how do you propose to stop the magazines from getting out there?
No point in complaining unless you have an answer. You just have to deal with it best you can. In here I can make a joke of it. With my daughters I did not blow my top but calmly explained and answered their questions. At the end of the day, IMHO, the knowledgable and trusted daughter is the one least likely to experiment or be "led astray".