No me neither, though my married state precludes me ever trying now!
I think the logic is that although not available on the NHS (since the 1940s, fact fans!), being circumcised is such a dirty horror that if you could possibly afford it you would pay to have it done privately. Most of these comments probably come from 19 year olds who have no notion of how unpopular and uncommon it is in Europe save for religious reasons.