Information on how slaves were treated in the 1,000 or so city states other than Athens is thin on the ground; for most of these city states we know next to nothing about them so comparisons between Athens and other cities are very difficult. Further, much of what we do know (even about slaves in Athens where are sources are far better than elsewhere) comes from thousands of small pieces of evidence, all of which have to be examined carefully in their context before any attempt can be made to relate them to other pieces of the puzzle. Putting all this together has already filled several books so it is impossible to give more than an overview here.
Males vs. Females
How slaves were viewed and treated really depended on their role; also non-Greek slaves were typically not treated as well as Greek ones, particularly as most Greeks were sensitive about having other Greeks as slaves (consequently, fellow Greeks captured in war were usually sold abroad). Much also depended on the owner: some were harsh masters who sometimes kept slaves in chains, others were much more lenient.
Both male and female slaves could be viewed quite positively (for a slave, that is) or with scant regard for their well-being. Female slaves were mostly used for domestic chores such as cleaning, shopping, fetching water and looking after children, and generally had a relatively comfortable life compared to those females (non-Greek) sold into prostitution where abuse was not uncommon. However, life could be hard for domestics under a harsh master while prostitutes in brothels could become hetairai and thus gain more control over their lives.
Male slaves also had varying fortunes. A slave who worked in the fields might have had a hard life or might have developed a close relationship with his smallholder master through working next to him every day. Male slaves were also used as domestics for a variety of chores, as were children.
Left: Athens, circa. 470 BC. Source: Getty Images ------- Right: Source: resourcesforhistoryteachers
In Athens at least, some male slaves held positions of importance in the state; for example, a slave was responsible for implementing regulations about silver coinage:
The main official responsible for implementing the law is a public
slave called the Dokimastes, or Tester...The
Tester was ordered to evaluate any coins given to him for examination.
....In the event that someone refuses to accept silver
coins approved by the Tester, all his goods on display that day are to
Although this was a position of some responsibility, the tester could be whipped for not doing his duty. Other male slaves were much less fortunate, especially those sent to labour in mines where the treatment was harsh and the work often dangerous. Thus, for the most part, the way slaves were regarded depended not on their sex but on their function. Nurses (female) were held in high regard as was sometimes the paidagogos (male, tutor and child-minder for a young boy). Perhaps the most famous example of the latter is Sicinnus, the paidagogos of Themistocles' children who was entrusted with delivering a false message to the Persians at Salamis.
Athens vs. other city states
As already noted, our knowledge of slavery outside of Athens is mostly limited. This is true even for Sparta:
It has been doubted whether Sparta had any slaves at all other than
helots...But there is some evidence...
Source: D. M. MacDowell, Spartan Law
Even the evidence we have is contradictory on, for example, numbers of slaves in Sparta compared to Athens. It is not unlikely that there were some slaves who performed duties similar to domestic ones in Athens and elsewhere, but we don't know for sure.
This passage from Xenophon strongly implies one difference between slaves in Athens and those in some other states:
Slaves and metics are allowed the greatest licence at Athens, and you
are not allowed to strike any of them there, nor will a slave stand
aside for you. Why this is the local custom, I will tell you: if it
were the law that a slave or metic or freedman could be struck by a
free man, you would often hit an Athenian thinking that he were a
slave; for the people there are no better dressed than slaves and
metics, nor is their appearance any better.
Source: Xenophon 'Constitution of the Athenians', cited in Matthew Dillon and Lynda Garland, Ancient Greece
We can also make a comparison on laws concerning slaves thanks to the survival of parts of the Gortyn Code in Crete. From this we know, for example, that fines were used as a means of punishment in Crete whereas in Athens flogging was common.
Ancient Greek law code at Gortys, Crete Attrib: By Afrank99 [CC BY-SA 2.5 (https://creativecommons.org/licenses/by-sa/2.5)], from Wikimedia Commons
For the most part, though, we can only assume in the absence of evidence that many aspects of slavery were the same or at least similar in most city states. Household slaves usually worked under the supervision of the wife of the owner and often became almost part of the family. Some female slaves became close and trusted confidants of their mistresses, as witnessed by funerary monuments. Others, though, were exploited sexually and many of these became concubines of their owners. Least fortunate were those used as prostitutes in brothels, for which there is evidence of in Corinth as well as Athens.
Prices depended not just on sex but also on where slaves came from, their age and their accomplishments. Slaves who appeared to be non-submissive would fetch a lower price. That said, the average price for a female slave was higher than that of a male slave according to Gustave Glotz in Ancient Greece at Work. Dillon and Garland cite the following example of a sale of slaves at auction:
Property of Kephisodoros, a metic [living] in the Peira[ieus]
- 165 dr. A Thracian woman
- 135 dr. A Thracian woman
- 170 dr. A Thracian
- 240 dr. A Syrian
- 105 dr. A Carian
- 161 dr. An Illyrian
- 220 dr. A Thracian woman
- 115 dr. A Thracian
- 144 dr. A Scythian
- 121 dr. An Illyrian
- 153 dr. A man from Colchis
- 174 dr. A Carian child
- 72 dr. A little Carian child
- 301 dr. A Syrian
- 151 dr. A Melitt[enian (man or woman)]
- 85[…] dr. 1 ob. A Lydian woman
One important source on manumissions is inscriptions. Unfortunately, many inscriptions do not indicate the sex of the slave but, of those that do, a substantial number were women. R. Zelnick-Abramovitz, in Not Wholly Free, cites many examples of such inscriptions from many different sites in Greece.
On whether female slaves were more or less likely to be manumitted, it has been suggested by some scholars that female slaves who were concubines may actually have been more likely to be manumitted. Also, male slaves in mines had almost no chance of manumission.
In addition to inscriptions (perhaps most notably the one in Crete pictured above), sources include Aristotle, Plato, Demosthenes, Thucydides, Plutarch, playwrights such as Aristophon and Euripides. Greek vases also show many of the tasks that slaves performed (as a quick search on google images shows).
The focus of sources tends to be either on slaves in general or on the jobs that slaves performed; with the latter in mind, it is usually evident which sex is being referred to. Thus, in most cases, indicating male / female wouldn't have been considered necessary by the authors of the various written sources.
Martin, Thomas R, Ancient Greece from prehistoric to Hellenistic times
Edward M. Harris, Democracy and the Rule of Law in Classical Athens
R. A. Tomlinson, Argos and the Argolid
Sandra R.Joshel and Sheila Murnaghan, Women and Slaves in Greco-Roman Culture
Keith Bradley and Paul Cartledge,eds., The Cambridge World History of Slavery, vol. 1