Well, maybe I'm "lenient" not "permissive", then Teen. 
Recently, DD1 wanted to go to a gig at a venue in London. She has been to Wembley before with her boyfriend, and I was okay with that. I felt they would be looking out for each other.
She didn't have a plan about who would be going to this second gig. It was someone's spare tickets. I felt really uncomfortable, but if she had come up with a good plan, I would have considered it. In the event, I checked, and the age restriction for the venue was 16 (she is still 15).
She was fine when I pointed this out. (And it gave me a get out, at the time. She's 16 in less than a month, though. Gaaaah!)
My point is, I would not have dismissed it out of hand, but would have been receptive to her ideas for how it could work.
She wanted her lip pierced for Christmas. We discussed it, and I said if the school was not happy with the clear retainer she was proposing to use, then she would have to take it out, and let it grow over. She accepted that, and so I let her have the piercing.
Some of her friend's parents have been quite shocked that I let her do that. So, to them I am possibly seen as permissive.