it works HOWEVER it is so impersonal that it just doesn't feel right
you know, most of the excitement of dating is the "thrill of the hunt". That is, it is fun to go to a bar, see a pretty girl, work up the nerve to talk to her and she talks back to your
dating/mating is one of the things that still keeps us in touch with our animal instincts- the internet just dulls the whole experience
online dating takes all that fun/excitement away
however, there are ALOT of hot girls on some of these websites