So true that its creepy. I've never done it, but I know people who have and many places around here have that kind of atmosphere as the defacto norm.
You can feel yourself being measured in a dozen different ways for things that have nothing to do with who you really are. It kind of freaks me out to the extent that I see myself get evaluated like a tuna at the Tokyo fish market when I have a few drinks with some friends at a local bar. Most of the women really truly could not care less about me unless my "statistics" are good (which unfortunately they are), so I've learned to lie to make myself seem less interesting from a purely statistical standpoint. The smart girls can see through it though (i.e. they usually extrapolate from personality or something), so it is a reasonably good filter.