My nearest local newsagent in my teens didn't sell top-shelf mags, but even if they had, I'd never have had the nerve to buy one there- their daughter used to help out in the shop at weekends, and she was in the same class as me at school!
The question of what to do if a woman was behind the counter when you went to buy a mag has been discussed a bit in the 'Your first wank over a mag' thread.
http://www.vintage-erotica-forum.com/t93479-p11-your-first-wank-over-a-mag.html
As I remember, a popular theme for readers' letters in Mayfair and the like, used to be stories of going into the shop to pick up the latest issue of your favourite mag- and picking up the woman behind the counter as well. No, it never happened to me either...
Certainly back in my teens, finding a woman behind the counter was enough to have me aborting mission and either rushing back out the door, or just buying a bar of chocolate instead, although later on I was much more laid-back about it.
There was still the occasional scary moment though- I've already told this story in another thread, but back in my early 20's my local Asian newsagent was often staffed by his wife, or their daughter, a student at the local college who helped out at weekends.
The mother always looked at me as if she thought I was a total pervert when I bought a mag, but finding the daughter in the shop was even worse- Not only did she do the 'Look of Disapproval' even better than her mum did, but she was about 19/20, absolutely gorgeous, and I seriously fancied her!
So now, not only do I get a disapproving stare from the girl behind the till when I buy a mag, but I'm also
desperately hoping she won't notice the hard-on I've just got because while I was waiting to be served, I couldn't help imagining her posing like the girl on the cover of the mag I'm about to buy...
Her mum was probably right about me!