You are partially correct. Most libertarians are in favor of open immigration, but with no welfare goodies, free education, free medical care being handed out, why would that be a problem. Given our rapidly aging population, we really need an influx of young immigrants. As for drugs, libertarians are for individual sovereignty - apparently many conservatives are not. Most libertarians don't care who you marry, so long as you choose a consenting adult. Libertarians are divided on the abortion question, usually depending on their degree of religiosity.