Carolyn is too polite @6 to describe how bad it can be for single female Libertarians. And unless she's used surveillance equipment, she probably doesn't even know just how differently many Libertarian men behave around/toward them. But these issues aren't at the beginning of the lines of causation here. It starts with a culture built around individualism, survivalism, evolutionary psychology, guns, science fiction/fantasy, engineering, computers, technicalities, polemics, one-upsmanship, iconoclasm, conspiracy theories, paranoia, the narcissism of small differences, factionalism, purity-testing, etc. The end result are demographics and norms so skewed that many Libertarian men wouldn't even understand why our few women aren't flattered by how solicitous some of our men are toward them.
The dynamic seems very similar to that of the engineering/technical world here in Silicon Valley. It's surely exacerbated by the fact that Libertarians explicitly question most of the legal and social norms that our patriarchal society uses to protect/repress females. Thus I'm impressed that @3 Carolyn can stand up and Just Say No to identity politics. Still, all of the above shows why it's very important for Libertarian women to seek each other out, both for support and for outreach. The same is true for Libertarian parents, which reminds me I still need to try to organize a "play date" for other local LP parents of young children.
If (passion for) technology is one of the underlying problems here, perhaps it can help towards a solution, too. After having worked on Yahoo Personals for eight years, I'm confident that Libertarians could improve our gender ratios through more intensive use of online dating. Perhaps this advice is itself symptomatic of the problem here, but it's hard to dispute that Libertarians should get better at mating and breeding.