The principal classification of the queens of the demi-monde, however, was into "domestic" and "learned" hetæræ. The former attracted chiefly by their beauty and their social grace; the latter, by their native wit, their vivacity, and their intellectual endowments. These gifted women entered into intimate relations with the philosophers and rhetoricians of the day; they visited the lecture halls, devoted themselves to earnest study, and carried on their prostitution under the protection of philosophy. They allied themselves with the various philosophical schools, and by their manner of bestowing their favors sought to advance the interests of the sect they espoused.

They found, too, in the pursuit of philosophy the justification of their calling. The hetæræ of the Academy claimed that they were merely putting into practice Plato's doctrine of the community of women. The followers of the Cyrenaic school, with its doctrine of moderation in the pursuit of pleasure, maintained that they carried out the maxims of Aristippus in their pursuit of the joys of love. The female adherents of the Cynics, or "the Bitches," as they were called, sought to surpass one another in taking the beasts as models of imitation. The Dialecticians found in their system the widest range for feminine cleverness of speech, and defended hetairism with the greatest subtlety and the most ingenious sophism. The feminine Epicureans saw in the teachings of their school, with its doctrine of friendship and of the broadest cultivation of the sensibilities, the fullest justification for the pursuit of sexual enjoyment, and they sought to illustrate the greatest voluptuousness and refinement in their methods of gratifying animal passion.

The hetæræ of the various schools surpassed the men in their imitation of the jargon and the manners of the leading lights of their systems. Many of the philosophers yielded themselves readily to the seductions of their beautiful and clever adherents; yet there were some choice spirits who deplored the demoralizing tendencies which hetairism brought into serious pursuits, and protested in no uncertain language.

These philosopher-hetæræ were indisputably the most interesting phenomenon in the social life of ancient times, to which the later Greek world and modern times afford no adequate parallel. They were present always at theatrical exhibitions and on all public occasions when respectable women remained at home. They took an absorbing interest in politics and in all public affairs; they discussed with the citizens the burning questions of the day; they criticised the acts of statesmen, the speeches of orators, the dramas of the poets, the productions of painters and sculptors. They exerted, in a word, an enormous influence for good or ill on the social and political life of the day; while they themselves had the consciousness of a mission to perform in having in their hands the real power of their sex.

Almost every great man in Athens had his "companion," usually in addition to a lawful wife. Plato had Archeanassa, to whom he wrote sonnets; but we know not what were her attractions. "For dear to me Theoris is," sings Sophocles; and we should like to know more of Archippa, to whom he left his fortune. Aristotle had his Herpyllis, and the eloquent Isocrates his Metaneira. Speusippus, Plato's successor, found a "companion" in Lasthenia, and Epicurus in Leontium. It is difficult to believe that all these for whom the learned men of the day showed such regard were vicious women; in fact, some of them are described as noble and high-minded.

"She was a citizen, without a guardian

Or any near relations, and her manner

Pure, and on virtue's strictest model form'd,

A genuine mistress [Greek: heraira]: for the rest of the crew

Bring into disrepute, by their vile manner,