"Libertarians" are the least "socially libertarian" people out there (excluding out-and-out fascists obviously).
How come?
Because the "Libertarian" philosophy of the isolated, will-driven individual (usually male) who makes his own choices and decisions is profoundly unlibertarian (and is in fact, a complete fiction). This is especially true when combined (as it always in "libertarianism") with a capitalist work ethic and consumerist (bourgeois) entitlement. It is a philosophy which best belongs in bad John Wayne movies and Ayn Rand's infantile scribblings.
