A libertarian, most likely male, who believes the opposite gender's love for liberty is the green light to make a pass. Unfortunately, the creepertarian does not receive signals of rejection, and drives the victim away from the liberty movement entirely.
Creepertarian: "So I heard you're in to liberty."
Girl: "Yeah! I love the Liberty Movement!"
Creepertarian: "Me too! Except I only adhere to the non-aggression principle outside of the bedroom..."
The Standard Creepiness Rule is an equation that determines the youngest possible age of a potential date that is deemed to be socially acceptable and not creepy. It was mentioned in comic 314 of the web-comic XKCD. According to XKCD, the rule is as follows:
"Your age" (in years)÷2+7=Minimum socially acceptable age of your date