About a month ago the second (only) depiction of a female gladiator was found. http://news.nationalgeographic.com/news/2012/04/120419-female-gladiator-statue-topless-science-ancient-rome/
In common belief female gladiators were usually lower class women, slaves or POWs. However, according to sources I found, a "gladiatrix career" was a "quite attractive" alternative for well born female citizens: http://www.roman-colosseum.info/gladiators/female-gladiators.htm http://penelope.uchicago.edu/~grout/encyclopaedia_romana/gladiators/amazones.html Apparently Juvenal did not like "gladiatrix concept":