Far from slaves
Reknown as something "no man can resist", Orion slave girls are far from slaves.
Orion slave girls were introduced in the very first pilot, the recently re-mastered "The Cage". Athough human, Vina receives an honorable mention as an Orion—she dressed and danced the part and set the standard for the franchise.
The next Orion slave girl wouldn't appear until season three in the original series (TOS): "Whom Gods Destroy". Marta was more animalistic and feral: from her darting eyes to her barefoot glide around Kirk and Spock. But she was later killed by her man, which goes to show that every hot babe has someone who is sick of her crap.
Even the wholesome Star Trek Animated Series (TAS) had the dancing, bikini-clad Devna in "The Time Trap". She wasn't officially a slave—she was a council member for the local pocket-dimension of Elysia—but she wasn't allowed to vacate her seat.
Orion slave girls continued to frolic in novels and comics, but these are widely viewed as non-canon. The emerald enchantresses didn't grace the screen again until Star Trek: Enterprise (ENT). There was the brief appearance of Neras in "Borderland", but not until "Bound" would an entirely different generation of characters and fans to be reintroduced properly.
The movements of the first few Orion girls—Vina, Marta and Devna—could only loosely be considered dancing. But Vavaar, Maras and D'Nesh were straight-up pole dancers who didn't need—or want—the pole. These three sisters were given to Captain Archer in an odd demonstration of friendship by a passing Orion ship. The jade jezebels subsequently spread their pheromones in an failed shot at the ship.
In popular culture, when (or rather, if) sexy and Star Trek are mentioned together, the green girls of Orion are almost always the subject—or will be soon after. In sci-fi culture, their seductive hold is rivaled only by bikini-slave Leia. In Star Trek culture, fanboys long to see a brave and shapely lass don the green body paint, whether at Comic-Con, Halloween...or McDonald's.