Django Middleware: Each user has to confirm that he is at least 18 years old

AdultsOnlyMiddleware.py

from django.core.urlresolvers import reverse
from django.shortcuts import redirect
from django.conf import settings

class AdultsOnlyMiddleware(object):
    """
        Each user has to confirm that he is at least 18 years old
        
        Note: No, I did not make this for some porn site.
    """
    url = reverse('confirm_your_age')
    adult_key = 'has_18'

    def process_request(self, request):
        if not request.session.get(self.adult_key, False):
            if request.POST.get(self.adult_key, False):
                request.session[self.adult_key] = True
                return redirect(request.GET.get('next'))
            if request.path_info != self.url and settings.MEDIA_URL not in request.path_info:
                return redirect( "%s?next=%s" % (self.url, request.path_info))
        elif request.path_info == self.url:
            return redirect('/')