I don't think my friend ever even had a date in the 7 years he lived in SF. He told me he pretty much had given up. He moves to NYC, in two weeks, before his apartment even has furniture, he gets a girlfriend. If a girl finds out you are single there, she will push you to go on dates with her single girlfriends.
At many bars here, there may be 5 guys to every girl, and only 3 or 4 girls might be single. Of course they get a constant stream of guys hitting on them so if you are an average guy, you will be shut down immediately.