Cindy,
Our facial lips must have a huge number of nerve endings because they must control facial musculature and be able to sense texture, temperature, etc.
If one were to press an object against a woman's southern lips or a guys equivalent, our grocery bag, without seeing the object, we would probably not be able to identify the object, whereas if we took an object into our facial lips, our identification probability would be greaty raised. That is why little kids put things into their mouths, to check them out....
Women's southern lips are just nature's left over male grocery bag skin that didn't close because there was no shopping at the supermarket for nuts to bring home....aside from providing an useful target of extensive foreplay, they don't play much of a role and thus have less nerve endings.
As to Canada, I have been there several times, and was quite disappointed that it took 5 days of being in Toronto before I heard someone say "...eh?"
Canada as a western country actually is fairly advanced in the cosmetic surgery field, with ultrasonic assisted lipoplasty being as prevalent as in the States. The US is THE place though for developing really bizarre but useful medical diagnostic equipment like 3D magnetic resonance imaging.